Patrick Pester

This green honeycreeper has male plumage on one half of its body and female plumage on the other half.

The shark is only the second in history to be observed regrowing a dorsal fin.

Scalloped hammerhead sharks used to seek refuge at two Mexican seamounts, but it appears fishing has killed them off.

Cannibalism is more common in the animal kingdom than you might think.

A new study re-examining old fossils collected by a Colombian priest more than 50 years ago has found they are actually rare hatchling turtles.

Chimps usually hunt for their meat, but a rare confrontation between a chimp and an eagle in Tanzania showcased their ability to scavenge.

The cat family has an amazing array of eye colors stemming from one unusual ancestor.

Researchers have found evidence that aftershocks may continue for centuries after a major earthquake — though the finding is still open for debate.

A new commentary blasts claims about Homo naledi featured in Netflix's "Unknown: Cave of Bones."

Researchers found three species of skink in Australia they feared could be extinct, including the Lyon's grassland striped skink.

Scientists have discovered that chimps living in Côte d'Ivoire carry out surveillance on each other to avoid or incite conflict — much like in human military operations.

DNA from a supposed Abominable Snowman actually came from a horse, but that doesn't mean stories of the Yeti passed on by local people aren't important.

Researchers are only beginning to understand the cryptic lives of the earless monitor lizards of Borneo.

Don't expect an alien invasion anytime soon.

Diprotodon dates back to the Pleistocene epoch and is a giant relative of wombats and koalas.

Nature doesn't have strict rules for cross-species coupling.

The earliest pliosaur 'megapredator' helped rule the oceans 170 million years ago during the age of dinosaurs.

Ancient caves mark the beginning of recorded burial rituals, but there's still so much we don't know about the history of human graves.

Orcas have their own dialect, greeting ceremonies and even wore salmon as hats in a weird fad during the 1980s.

Researchers used DNA analysis and traditional knowledge to learn about an orca named Old Tom and his family's remarkable relationship with humans.

Nature must think willies are funny, too.

The "law of increasing functional information" says that complex systems in nature evolve to become more complex.

Killer whales are surprisingly gentle in the wild when interacting with humans — though it's sometimes a different story with orcas in captivity.

The center of Earth lies around 4,000 miles beneath our feet — but what lies beneath the outer crust and the inner core?