It lacks an answer.
The best similarity you can find is that they're all black.
whale
train whales
Yes a Penguin is a food source but humans don't really eat Penguin we can but we don't. The penguin is eaten by the killer whale and the leopard seal.
At least an adult.
piano keys
---- They are many whales like the blue whale (the biggest mammal in the world) that are faster, but not all are. ----
To humans but not to animals such as the penguin or the killer whale
It is the Humpback whale
Penguin does not belong because it is a bird, and all the others are mammals.
I would say that the blue whale, and the sperm whale were least common.
they are whales trust me
I think the tooth whale is but not the penguin