Riddle #46: The Bragger

Here's the next riddle. I predict that this one will be easy:

You're at a party, and you hear a man bragging about his recent trip to Africa. He was hunting rhinos, he said. He described in detail several wild animals he saw while exploring Africa, including hippos, tigers, elephants and giraffes. He talked about drinking camel's milk and picking coconuts. He also described how he finally got his rhino. "Well, that man is obviously lying," you tell your friend. How do you know?

NOTE: The correct answer has been guessed. To read it, see the comments section.
Lateral Thinking Puzzlers by Paul Sloane has lots of classic riddles, clues and answers. Click here to order it.