Elephants gathered at a watering hole in the relative safety of Serengeti National Park. In unprotected areas with dense human populations, the animals showed higher stress hormone levels.
Earth's earliest known forms of animal life were trailblazers.
“Vision” in single-celled Synechocystis works by principles similar to the human eye.
The fate of the Caspian seal may have been decided ﬁve million years ago.
Robber ﬂies are top predators in the insect world.