Dolphins use sponges as tools

I read a report on Discovery Channel News that says dolphins use sponges as tools when probing the sea floor for fish. The dolphin puts a sponge over its snout to protect itself while probing. They believe the technique is taught from mother to child.

Scientists label this a "material culture" and it has only been seen in chimpanzee and orangutan cultures before. This is the first they've seen it in marine mammels. You can read the full story here.