Among the most remarkable animal stories are those involving friendships where we might not expect them.  A friendship between man and dog is not surprising — after all, a dog is man’s best friend.  Nor is it surprising to find a friendship between two dogs — or two men. We expect intraspecies friendships. But then we don’t.  A friendship between two fish would surprise us, or between two invertebrates, two amphibians, or two reptiles.  And we are surprised when we come upon apparent friendships between two very different species, such as cat and bird or duck and owl. In this piece, I want to explore my own questions about animal friendships. What is friendship? Friendship between two people can involve many conditions, such as…