The veteran naturalist and broadcaster, who is presenting a new series called David Attenborough's Natural Curiosities on Watch, said there were "one or two" mythical creatures he would like to find.
He said: "I mean I wouldn't mind finding the Abominable Snowman for a start.
"There is still a mystery about the Abominable Snowman, there are teeth that were found back in the 1920s, huge molar teeth about six times the size of ours, immense things, they were found in a Chinese druggists store and undoubtedly are the teeth of a giant ape that must have lived relatively recently itself and that could have been the Abominable Snowman."
The legendary creature, which is also known as The Yeti, is often described as a giant ape and sightings have been reported in the Himalayan region of Nepal and Tibet.
Sir David said: "I don't say I necessarily believe in it, I'm saying that there is evidence and of course one of the very difficult things ever to do is prove a negative, to prove that it doesn't exist."