Zebra Chews Rhino's Horn
Here's a great example of odd animal companions. According to the description of the YouTube video below, this odd footage was captured at Zoo Malacca in Malaysia. It features a zebra and a rhinoceros who are very friendly with each other--perhaps a little too friendly for the rhino's liking.
You don't normally see zebras and rhinos in the same enclosure and I don't know the back story here, but it looks to like these animals have known each other for a while, perhaps since their youth, and are quite comfortable with each other. Otherwise the zebra probably wouldn't have gotten away with its antics.
I actually feel bad for the rhino, who seems to just want to go about his business while his pesky friend can't stop trying to nibble on his horn.
Get more videos of rhinos in action here.