1) There are 2 groups of Whales. These are baleen and toothed whales. Baleen whales do not have teeth, and instead have mesh-like plates in their mouths that help them filter tiny food.
2) Usually only male narwhals have a tusk
3) The antarctic blue whale is the largest animal on the planet
4) Killer whales aren't actually whales
5) The word narwhal comes from old norse
