Elephants and other mammals that lost their scrotums offer a peek at the genitals of our common ancestor.
Individuals will compromise on their own temperature preferences to gain the benefits of group life.
When assessing their enemies, chameleons may be better off looking at color rather than the size and shape of their opponents' bodies.
In a Brazilian lagoon, dolphins that don't cooperate with people must range farther to find food.
Trainers have used Lasix for decades to reduce bleeding and improve performance in North American racehorses.