The fin whale reaches 17.1 m in males, 18.6 m in females and can weigh 25,000. It is similar to the fin whale, although larger, darker and slimmer, and with a single face. The head has similar proportions to that of the fin whale, showing 1/4 to 1/5 of its total length, but narrower when viewed from above and with a well defined crest. The general coloration is dark gray or brown (it can be close to black), sometimes similar to galvanized metal, except in the ventral area, which is whitish and of variable extension.

It has a slim body with a dorsal fin that can measure about 12 inches. High. A distinctive feature of this species are the curved and bulging characteristics (usually called the "elbow") midway along each of the fins. The false killer whale has a uniform color (dark gray to black). It grows up to 6 m long, can weigh 1,500 kg and live for about 60 years. It is a sociable animal, living in groups of 10 to 50 individuals.

The most distinctive feature of the fin whale is its coloration. The dorsal and lateral body is black or dark gray-brown, gradually turning white towards the ventral area. However the color on the head is asymmetrical. The right side of the face is light gray and the jaw is white, like the rest of the coloration of the throat and belly. The left half of the face is darker, with the jaw and part of the throat dark gray. It presents a series of transverse discolorations on the back behind the head, the most apparent in the shape of an inverted V and more marked on the right side.

The common dolphin is present in most of the seas of the planet. It is easily identifiable by the special yellowish coloration on the flanks. They can be seen more likely in winter. Weight: 80-130 kg. Size: up to 2.5 meters.