After debating this question for the past 150 years, biologists still cannot agree on which of these two factors was the most ...

Animation describing the evolution of the giraffe. 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 ...

Animation describing the evolution of the giraffe. 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 ...

This story appears in the October 2019 issue of National Geographic magazine. At 14 to 19 feet tall, giraffes tower over the entire animal kingdom. But their iconic height, which evolved over ...

A commonly used example is the giraffe. According to Lamarck’s theory of evolution, giraffes have long necks because their ancestors constantly stretched to reach leaves high up in trees ...

东非大裂谷（Great Rift ...

The giraffe is the tallest terrestrial mammal in the world. The males stand about 5m tall - as high as a single-story house - and the females are just a little shorter. The giraffe has an incredibly ...

Time was running out for Asiwa, a Rothschild’s giraffe in western Kenya. For years, she and seven other giraffes had been living on a peninsula that reached out into Lake Baringo. But rising ...

Mice and giraffes may look like they could not be more different from each other. But under the surface they have more in common than it may first seem. There are thought to be over 5,400 species of ...

What mechanisms can produce the chameleon's camouflage or the giraffe's long neck? Why do ecosystems contain a wide diversity of ... the role of information in the transmission of infectious diseases, ...