Animals

Lengthening days set off a cascade of events in migratory birds that culminates in the birth of a clutch of chicks

Researchers close in on a taxonomic home for one of paleontology’s weirdest wonders, the Tully Monster

Hibernating brown bears avoid the blood clots that can develop in even temporarily immobile people. Scientists now think they know how the animals do it

Killer whales rip open the bellies of sharks to snag the liver. Other predators also have dietary preferences for organs, brains and additional rich body parts

A small, bizarre-looking fish found more than five miles under the sea is considered the deepest fish ever recorded

How do giant filter-feeding whales find their tiny prey? The answer could be key to saving endangered species

The menagerie that twirls and twirls includes gorillas, bonobos and, yes, us humans

In Key Largo, Fla., scientists are looking to protect endangered native rodents and slow the invasion of massive Burmese pythons

A spider that caught and devoured a much larger shrew for its meal adds to evidence that more spiders aren’t strangers to dining on vertebrates

A team of moth and butterfly scientists decided to go from a restaurant bar to the lab bench to understand mescal’s iconic “worm”

A glaring disparity exists between the biomass of humans and that of both terrestrial and aquatic mammals

Like chimpanzees, bees can learn specific strategies for opening a puzzle box and accessing a reward inside by mimicking the behavior of their trained mates