Dolphins use sponges as tools - Jun 6, 2005

CNN.com - Researchers: Dolphins use sponges as�tools - Jun 6, 2005: "
WASHINGTON (AP) -- A group of dolphins living off the coast of Australia apparently teach their offspring to protect their snouts with sponges while foraging for food in the sea floor.
'Cultural evolution, including tool use, is not only found in humans and our closest relatives, the primates, but also in animals that are evolutionally quite distant from us. This convergent evolution is what is so fascinating,' said Kruetzen."