A classic example of natural selection at work is the origin of giraffes’ long necks. The ancestors of modern giraffes were animals similar to deer or antelope, with necks of ordinary length.

But something happened over the past millennia that drove giraffes to evolve the longest necks of any living animal. What ...

xiezhi may not be that close of a relative to modern giraffes, he argues, so their headbutting behavior may not tell us much about how long necks evolved ... s eyes that we should take this sexual ...

Sam, a young tortoise, wishes he had a longer neck to reach the nicest leaves. Grandad Charlie tells Sam a story about giraffes. Long ago, giraffes didn’t have long necks. They wanted to eat the ...

Description: The tallest land mammal, with a neck as long as 6 feet, the giraffe is also well known for the unique brown and white pattern on its coat (“pelage”) and its lengthy eyelashes and legs.

Natural selection is a mechanism of evolution ... of organisms that are more likely to survive to reproduce. For example, evolving long necks has enabled giraffes to feed on leaves that others can’t ...

Sam, a young tortoise, wishes he had a longer neck to reach the nicest leaves. Grandad Charlie tells Sam a story about giraffes. Long ago, giraffes didn’t have long necks. They wanted to eat the ...