Gray whales and belugas are benthic feeders, sieving organisms from oceanic mud. A billion is a thousand million. Multicellular life evolved on Earth about a billion years ago. Whales breathe air through their blowhole. Blowholes are located on the top or back of the head.
Blue whales are an endangered species.
A bonebed usually indicates that the fossilized animal lived in groups. They fossilize well. The shape of the melon is changable. This carnivore eats fish and crabs. Gray whales and belugas are benthic feeders, sieving organisms from oceanic mud.