How a group of iguanas travelled across the water to the island of Anguilla may surprise you.
In evolutionary terms, a "successful" organism is one that passes on its genes -- not necessarily one that lives a long life.
In this instance, nature is said to have “selected” the camouflaged butterfly over other variations that weren’t as well hidden. In “artificial selection,” the same thing happens, only we human beings make the choices.
Point at a ball and a dog will look at the ball, whereas a cat will probably look at your hand. Dogs seem to have a ready understanding of how human beings direct attention by pointing, and can follow our gestures almost as if they thought the same way we do. Of course, dogs probably [...]