1. Among apes, other than human beings, chimpanzees only catch a cold and cough.
2. Only honey bees and eagles have the ability to look at the sun directly.
3. Among birds, only parakeets have the ability to speak.
4. All animals can understand human languages. But, only a few humans can understand the language of animals.
5. Dogs are so intelligent that they begin to bark in such a way that it sounds like human language. This can happen if there are many people living near the dogs.