The common name of the sperm whale

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Other connective tissue, such as external ears, has been lost, and the male genitalia have moved internally. Keep Exploring Britannica Animal. This information leads scientists to conclude that a bottleneck must have occurred near the end of the last deglaciation, a time that coincided with rapid temperature decrease and a rise in eustatic sea level. The newborn instinctively swims to the surface within 10 seconds for its first breath; it is helped by its mother. The huge heads of sperm whales contain a large cavity, the spermaceti organ, filled with a waxy liquid called spermaceti oil. For the ray-finned fish known as common dolphin, see Mahi-mahi. When dolphins ride a bow wave , they coast at the speed of the ship while expending very little energy see below.

Before they swallow their food, toothed whales disable it; biologists think that some can stun their prey by emitting a high-energy burst of sound. One way to quantify the presence of a special sense in an animal is to consider the organs involved. Amazon river dolphin I. This article is about the dolphin. This low frequency could be related to the relatively low rate of molecular evolution in cetaceans; however, considering that the decrease in the rate of molecular evolution in the baiji was not as great as the decrease in heterozygosity rate, it is likely that much if the low genetic diversity observed was caused by the precipitous decline in the total baiji population in recent decades and the associated breedings.