A new study demonstrates that crows can discriminate between patterns with regular and irregular geometric arrangements. Researchers presented crows with images featuring dot patterns and trained them to identify either regular or irregular patterns as rewarding. The crows successfully learned to distinguish between the two types of patterns, even when presented with novel configurations, suggesting they possess an abstract understanding of geometric regularity, similar to primates and human infants. This ability may be linked to the crows' complex social lives and need to recognize individuals and their relationships.
Research suggests bonobos can combine calls in a structured way previously believed unique to humans. Scientists observed that bonobos use two distinct calls – "peep" and "grunt" – individually and in combination ("peep-grunt"). Crucially, they found that the combined call conveyed a different meaning than either call alone, specifically related to starting play. This suggests bonobos aren't simply stringing together calls, but are combining them syntactically, creating a new meaning from existing vocalizations, which has significant implications for our understanding of language evolution.
HN users discuss the New Scientist article about bonobo communication, expressing skepticism about the claim of "unique to humans" syntax. Several point out that other animals, particularly birds, have demonstrated complex vocalizations with potential syntactic structure. Some question the rigor of the study and suggest the observed bonobo vocalizations might be explained by simpler mechanisms than syntax. Others highlight the difficulty of definitively proving syntax in non-human animals, and the potential for anthropomorphic interpretations of animal communication. There's also debate about the definition of "syntax" itself and whether the bonobo vocalizations meet the criteria. A few commenters express excitement about the research and the implications for understanding language evolution.
OpenVertebrate has launched a free, accessible database containing over 13,000 3D scans of vertebrate specimens, including skeletons and soft tissue. Sourced from museums and research institutions worldwide, these scans allow researchers, educators, and the public to explore vertebrate anatomy and evolution in detail. The project aims to democratize access to these resources, enabling new discoveries and educational opportunities without requiring physical access to the specimens themselves. Users can download, 3D print, or view the models online using a dedicated viewer.
HN commenters generally expressed enthusiasm for the OpenVertebrate project, viewing it as a valuable resource for research, education, and art. Some highlighted the potential for 3D printing and its implications for paleontology and museum studies, allowing access to specimens without handling fragile originals. Others discussed the technical aspects, inquiring about file formats and the scanning process. A few expressed concerns about the long-term sustainability of such projects and the need for consistent funding and metadata standards. Several pointed out the utility for comparative anatomy and evolutionary biology studies. Finally, some users shared links to related projects and resources involving 3D scanning of biological specimens.
Jumping spiders, a diverse group with over 600 species in North America, are known for their exceptional vision, complex courtship rituals, and unique hunting strategies. Rather than building webs, they actively stalk prey using their keen eyesight to judge distances for remarkable jumps, often secured by a silk dragline. Their vibrant colors and intricate movements, particularly the males' elaborate dances and ornamentation to attract females, make them fascinating subjects of study. They play a crucial role in controlling insect populations and contribute significantly to biodiversity.
HN users discuss the jumping spider's intelligence and hunting prowess, referencing the article's description of their ability to plan routes and learn from trial-and-error. Several commenters share personal anecdotes of observing these spiders' remarkable behaviors, including their curiosity and seemingly playful interactions. Some express fascination with their complex visual system and hunting strategies, contrasting their cognitive abilities with their small size. The discussion also touches on spider taxonomy, with one user clarifying the distinction between jumping spiders and other spider families. A few commenters humorously suggest potential applications of jumping spider intelligence, such as training them for tiny tasks.
Michael LaBarbera's "The Biology of B-Movie Monsters" analyzes the biological plausibility of classic movie monsters. He applies basic principles of biomechanics, scaling, and physiology to creatures like Godzilla, King Kong, and giant ants, demonstrating how their depicted size and abilities often defy the laws of nature. LaBarbera explores the square-cube law, explaining why enormous creatures would crumble under their own weight and how the energy requirements for movement and bodily functions would be insurmountable. He uses humorous calculations and engaging examples to deconstruct the fantastical elements of these films, highlighting the inherent conflict between Hollywood spectacle and scientific realism.
Hacker News users discuss the plausibility and biological implications of B-movie monster tropes. Several commenters analyze the feasibility of giant creatures, citing the square-cube law and its effects on structural integrity, locomotion, and metabolism. Discussions touch on Godzilla's improbable size, the necessary adaptations for giant insects, and the potential for alternative biological mechanisms that might enable such creatures. The impracticality of rapid growth and metamorphosis seen in many monster movies is also pointed out. Some users recommend other resources exploring similar concepts, like Haldane's essay "On Being the Right Size." Several express appreciation for the original article's engaging and informative approach to the subject.
A study published in Primates reveals that chimpanzees exhibit engineering-like behavior when selecting materials for tool construction. Researchers observed chimpanzees in Guinea, West Africa, using probes to extract algae from ponds. They discovered that the chimps actively chose stiffer stems for longer probes, demonstrating an understanding of material properties and their impact on tool functionality. This suggests chimpanzees possess a deeper cognitive understanding of tool use than previously thought, going beyond simply using available materials to strategically selecting those best suited for a specific task.
HN users discuss the implications of chimpanzees selecting specific materials for tool creation, questioning the definition of "engineer" and whether the chimpanzees' behavior demonstrates actual engineering or simply effective tool use. Some argue that selecting the right material is inherent in tool use and doesn't necessarily signify advanced cognitive abilities. Others highlight the evolutionary aspect, suggesting this behavior might be a stepping stone towards more complex toolmaking. The ethics of studying chimpanzees in captivity are also touched upon, with some commenters expressing concern about the potential stress placed on these animals for research purposes. Several users point out the importance of the chimpanzees' understanding of material properties, showing an awareness beyond simple trial and error. Finally, the discussion also explores parallels with other animal species exhibiting similar material selection behaviors, further blurring the lines between instinct and deliberate engineering.
UNC researchers have demonstrated how loggerhead sea turtles use the Earth's magnetic field to navigate. By manipulating the magnetic field around hatchlings in a special tank, they showed that the turtles use a "magnetic map" to orient themselves towards their natal beach. This map allows them to identify their location relative to their target destination, enabling them to adjust their swimming direction even when displaced from their original course. The study provides strong evidence for the long-hypothesized magnetic navigation abilities of sea turtles and sheds light on their remarkable open-ocean migrations.
Hacker News users discussed the methodology and implications of the turtle navigation study. Several commenters questioned the sample size of the study (seven turtles) and whether it's enough to draw broad conclusions. Some debated the ethics of attaching GPS trackers to the turtles, expressing concern about potential harm. Others pointed out that the Earth's magnetic field fluctuates, wondering how the turtles adapt to these changes and how the researchers accounted for that variability in their analysis. A few users drew parallels to other animals that use magnetic fields for navigation, speculating on the common mechanisms involved. The lack of open access to the full study was also lamented, limiting deeper discussion of the findings.
The essay "In Praise of Subspecies" argues for the renewed recognition and utilization of the subspecies classification in conservation efforts. The author contends that while the concept of subspecies has fallen out of favor due to perceived subjectivity and association with outdated racial theories, it remains a valuable tool for identifying and protecting distinct evolutionary lineages within species. Ignoring subspecies risks overlooking significant biodiversity and hindering effective conservation strategies. By acknowledging and protecting subspecies, we can better safeguard evolutionary potential and preserve the full richness of life on Earth.
HN commenters largely discussed the complexities and ambiguities surrounding the subspecies classification, questioning its scientific rigor and practical applications. Some highlighted the arbitrary nature of defining subspecies based on often slight morphological differences, influenced by historical biases. Others pointed out the difficulty in applying the concept to microorganisms or species with clinal variation. The conservation implications were also debated, with some arguing subspecies classifications can hinder conservation efforts by creating artificial barriers and others suggesting they can be crucial for preserving unique evolutionary lineages. Several comments referenced the "species problem" and the inherent challenge in categorizing biological diversity. A few users mentioned specific examples, like the red wolf and the difficulties faced in its conservation due to subspecies debates.
After an absence of roughly 5,000 years, a spotted hyena has been confirmed in Egypt. Researchers identified the animal through camera trap footage captured in Wadi El Gemal National Park, a protected area in the country's Eastern Desert. This rediscovery is significant, as it marks the return of a large carnivore that was once part of Egypt's ancient fauna and suggests potential range expansion for the species. While the hyena's origin—whether it migrated naturally or was accidentally introduced—remains unclear, its presence has sparked both excitement and concern among researchers who are now working to understand the implications for the local ecosystem.
HN commenters discuss the implications of a spotted hyena being found in Egypt after a 5,000-year absence. Some express skepticism about the claim, pointing to historical accounts and anecdotal evidence suggesting hyenas may have been present more recently, albeit rarely. Others highlight the challenges of definitively proving local extinction and subsequent re-emergence versus continuous, low-density presence. The difficulty of species identification from skeletal remains, especially differentiating striped and spotted hyenas, is also raised. Finally, commenters discuss potential reasons for the hyena's scarcity, including habitat loss and human persecution.
Giant clams' evolutionary success is linked to their symbiotic relationship with algae. Researchers found that the clams' gills evolved specifically to house these algae, which provide the clams with essential nutrients through photosynthesis. This reliance on algae allowed giant clams to thrive in nutrient-poor tropical waters where other clams struggle, contributing to their large size and unique shell features like wavy margins and colorful mantles, both of which maximize light exposure for the algae. Essentially, the algae fueled the clams' gigantism and distinctive characteristics.
HN commenters discuss the symbiotic relationship between giant clams and algae, with several expressing fascination. Some question the article's assertion that the algae "shaped" the clam's evolution, arguing that co-evolution is a more accurate description. One commenter highlights the surprising genetic diversity within the algae, suggesting further research. Another points out the clam's impressive lifespan and the potential impact of climate change on this delicate symbiosis. A few users share personal anecdotes about encountering giant clams while diving, emphasizing their size and beauty. Finally, there's a brief discussion about the potential for giant clams to be a sustainable food source, although concerns about overfishing are raised.
The concept of the "alpha wolf" – a dominant individual who violently forces their way to the top of a pack – is a misconception stemming from studies of unrelated, captive wolves. Natural wolf packs, observed in the wild, actually function more like families, with the "alpha" pair simply being the breeding parents. These parents guide the pack through experience and seniority, not brute force. The original captive wolf research, which popularized the alpha myth, created an artificial environment of stress and competition, leading to behaviors not representative of wild wolf dynamics. This flawed model has not only misrepresented wolf behavior but also influenced theories of dog training and human social structures, promoting harmful dominance-based approaches.
HN users generally agree with the article's premise that the "alpha wolf" concept, based on observations of captive, unrelated wolves, is a flawed model for wild wolf pack dynamics, which are more family-oriented. Several commenters point out that the original researcher, David Mech, has himself publicly disavowed the alpha model. Some discuss the pervasiveness of the myth in popular culture and business, lamenting its use to justify domineering behavior. Others extend the discussion to the validity of applying animal behavior models to human social structures, and the dangers of anthropomorphism. A few commenters offer anecdotal evidence supporting the family-based pack structure, and one highlights the importance of female wolves in the pack.
Alfred Goldsborough Mayer's 1897 article explores the coloration of lepidopteran wings. He details meticulous experiments investigating pigment and structural colors, arguing that the latter, caused by physical wing structures like scales and ridges, produce iridescent and metallic hues. Mayer examines the influence of temperature and humidity on pupal development and resultant wing color, finding that these factors can significantly alter color patterns. He also delves into the protective value of coloration, noting mimicry and camouflage strategies, and theorizes about the physiological processes underlying pigment formation. Ultimately, Mayer connects color variations to environmental influences and adaptation, suggesting the importance of physical laws and evolutionary pressures in shaping lepidopteran wing coloration.
Hacker News users discussed the beautiful illustrations in the 1897 book, with some noting the incredible detail and artistry involved in creating them. Several commenters pointed out the historical significance of the work, mentioning the limitations of printing technology at the time and marveling at the quality achieved. There was also discussion about the scientific value of such meticulous documentation of natural patterns, with some wondering about the original purpose of the research and others highlighting the ongoing relevance of studying these patterns. One commenter even connected the aesthetic appeal of the patterns to their potential functionality in nature, such as camouflage.
Summary of Comments ( 67 )
https://news.ycombinator.com/item?id=43717251
Hacker News commenters discuss the intelligence of crows and other corvids, with several pointing out prior research showcasing their impressive cognitive abilities like tool use, problem-solving, and social learning. Some express skepticism about the study's methodology and whether it truly demonstrates an understanding of "geometric regularity," suggesting alternative explanations like a preference for symmetry or familiarity. Others delve into the philosophical implications of animal cognition and the difficulty of defining "intelligence" across species. A few commenters share anecdotes of personal encounters with crows exhibiting intelligent behavior, further fueling the discussion about their complex cognitive abilities. The overall sentiment leans towards acknowledging the remarkable intelligence of crows while also maintaining a healthy scientific skepticism towards interpreting the results of any single study.
The Hacker News post "Crows can recognize geometric regularity," linking to a Phys.org article about the same topic, has generated several comments discussing the research and its implications.
Several commenters express awe and fascination at the cognitive abilities of crows, with some highlighting the growing body of evidence demonstrating their intelligence. One commenter points out that crows have been shown to understand water displacement, tool use, and even have funerals for their dead. This commenter emphasizes the remarkable nature of these findings given the evolutionary distance between corvids and primates.
Another thread of discussion revolves around the methodology of the study and what it truly demonstrates. Some question whether the crows are actually recognizing "geometric regularity" in the abstract sense, or if they are simply responding to visual patterns and similarities. A commenter suggests that further research could explore whether crows perceive these patterns similarly to how humans perceive them, or if their understanding is based on different criteria. Another user proposes a control experiment to rule out the possibility that the crows are simply choosing patterns based on factors like brightness or contrast, rather than geometric regularity.
Several users draw comparisons between crows and other intelligent animals, like octopuses and dolphins, marveling at the diverse evolution of intelligence in the animal kingdom. One commenter speculates about the potential advantages of recognizing geometric patterns in nature, such as identifying camouflaged prey or building nests.
There's also a brief exchange about the potential ethical implications of recognizing advanced intelligence in animals, with one user suggesting it could lead to reconsiderations of our relationship with and treatment of these species.
Finally, some comments are more lighthearted, expressing admiration for crows or sharing anecdotes about their own encounters with these birds. One commenter humorously suggests that crows may be using their geometric understanding to build increasingly elaborate and stylish nests.