[There's a pause before Ginia replies, the light clacking of keys filling the silence before the next message is read.]

Yes, whales, though they aren't fish. They're mammals. [Ginia wonders if the person she's talking to would know what mammals are. She quickly types in a response to be on the safe side.]

Mammals are animals that have hair (as opposed to scales or feathers) and nurse their young. Humans, dogs, and whales are all different types of mammals.