Biology

Articles:
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

379 Discovery of a body-wide photosensory array that matures in an adult-like animal and mediates eye–brain-independent movement and arousal.
https://www.pnas.org/content/118/20/e2021426118

378 Extreme altitudes during diurnal flights in a nocturnal songbird migrant.
https://science.sciencemag.org/content/372/6542/646

377 Towards complete and error-free genome assemblies of all vertebrate species.
https://www.nature.com/articles/s41586-021-03451-0

376 Platypus and echidna genomes reveal mammalian biology and evolution.
https://www.nature.com/articles/s41586-020-03039-0

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