- The oldest fossils found are 55 million years old - At birth, whale calves are 5 meters long and weigh 3 tons. Adults reach between 12 and 16 meters long and may weigh up to 55 tons - The top jaw is long and thin: its head measures a quarter of its total body - On the upper part of the head there are two blowholes (spiracles) from which they breathe . - As they grow, their heads are covered by callosities, which makes it possible to identify them. - They have between 200 and 270 baleens on each side: they are rigid plates located on the top jaw as if they formed a comb. - Its skin is plain and elastic, dark blue (almost black), although sometimes it is dark brown. - They have irregular white patches in their underbelly - It has a caudal fin (the tail) and pectoral fins - It has no dorsal fin like most of the whales - Several males compete for one female and several may mate the female
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