399 The number of tree species on Earth.
https://www.pnas.org/content/119/6/e2115329119
398 A century of ringing records implies that reed warblers use the Earth’s magnetic field as a stop sign to identify their natal breeding sites.
https://www.science.org/doi/10.1126/science.abj4210
397 Nitrogen recycling via gut symbionts increases in ground squirrels over the hibernation season.
https://www.science.org/doi/10.1126/science.abh2950
396 Conservation of magnetite biomineralization genes in all domains of life and implications for magnetic sensing.
https://www.pnas.org/content/119/3/e2108655119
395 Rational regulation of water-seeking effort in rodents.
https://www.pnas.org/content/118/48/e2111742118
394 The physical basis of mollusk shell chiral coiling.
https://www.pnas.org/content/118/48/e2109210118
393 Quantum magnetic imaging of iron organelles within the pigeon cochlea.
https://www.pnas.org/content/118/47/e2112749118
392 Cardiopharyngeal deconstruction and ancestral tunicate sessility.
https://www.nature.com/articles/s41586-021-04041-w
391 Leprosy in wild chimpanzees.
https://www.nature.com/articles/s41586-021-03968-4
390 Ivory poaching and the rapid evolution of tusklessness in African elephants.
https://www.science.org/doi/10.1126/science.abe7389
389 Why animals swirl and how they group.
https://www.nature.com/articles/s41598-021-99982-7
388 Tardigrades exhibit robust interlimb coordination across walking speeds and terrains.
https://www.pnas.org/content/118/35/e2107289118
387 Naïve orangutans (Pongo abelii and Pongo pygmaeus) individually acquire nut-cracking using hammer tools.
https://onlinelibrary.wiley.com/doi/10.1002/ajp.23304
386 Chronic social isolation signals starvation and reduces sleep in Drosophila.
https://www.nature.com/articles/s41586-021-03837-0
385 Isotopic records from a 17,100-year-old woolly mammoth tusk reveal long-distance mobility, preferred habitats, and an extensive lifetime range.
https://science.sciencemag.org/content/373/6556/806
384 Innovation and geographic spread of a complex foraging culture in an urban parrot.
https://science.sciencemag.org/content/373/6553/456
383 Rank-dependent social inheritance determines social network structure in spotted hyenas.
https://science.sciencemag.org/content/373/6552/348
382 Birds use individually consistent temperature cues to time their migration departure.
https://www.pnas.org/content/118/28/e2026378118
381 Thyroid hormones regulate the formation and environmental plasticity of white bars in clownfishes.
https://www.pnas.org/content/118/23/e2101634118
380 Extreme lifespan extension in tapeworm-infected ant workers.
https://royalsocietypublishing.org/doi/10.1098/rsos.202118
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