WASHINGTON (Reuters) ? On a misty mountaintop on the Indonesian island of Sulawesi, scientists for the first time in more than eight decades have observed a living pygmy tarsier, one of the planet's smallest and rarest primates.

Tarsiers are unusual primates -- the mammalian group that includes lemurs, monkeys, apes and people. The handful of tarsier species live on various Asian islands.

As their name indicates, pygmy tarsiers are small -- weighing about 2 ounces (50 grammes). They have large eyes and large ears, and they have been described as looking a bit like one of the creatures in the 1984 Hollywood movie "Gremlins."

They are nocturnal insectivores and are unusual among primates in that they have claws rather than finger nails.

They had not been seen alive by scientists since 1921. In 2000, Indonesian scientists who were trapping rats in the Sulawesi highlands accidentally trapped and killed a pygmy tarsier.