Mammals: Whales
- Marine mammals: fin-like front limbs and tail, vestigial back limbs.
- Homeothermic or warm-blooded organisms, like all other mammals.
- Suckle their young with their mammary glands
- Whales come up for air to breathe: they have no gills, which means that they cannot breathe under water.
- Baleen whales (such as the blue whale) eat plankton and small animals.
- Toothed whales (such as sperm whales) are predators.
- Large animals: blue whales can grow over 30 meters long!