Mammals are vertebrate animals that have hair, a heart with four chambers, a diaphragm and mammary glands. Two mammals whose common names begin with the letter N are the nine-banded armadillo and the northern bottlenose whale.Know More
Other mammals whose common names begin with the letter N include the North American river otter and the naked mole rat.
There are also several mammals whose scientific names begin with the letter N. Neophoca cinerea is the scientific name for the Australian sea lion, Neovison vison is the scientific name for the American mink and Nasalis larvatus is the scientific name for the proboscis monkey.Learn more about Zoology
The four chambers of the heart are the right atrium, left atrium, right ventricle and left ventricle. The atria are the two upper chambers that receive blood from the veins. The ventricles are the two lower chambers that pump blood into the arteries.Full Answer >
Mammals and birds have four-chambered hearts. However, birds have much larger hearts in proportion to their size than mammals do, and their hearts pump more blood per minute than mammals of the same size.Full Answer >
Many cephalopods (including squids and octopuses) have three hearts, while earthworms have five hearts and hagfish have four. An operation exists in which a surgeon can put an additional heart into a human that can supplement the original.Full Answer >
Mammals have hair or fur because they are warm-blooded, and hair helps to keep them warm or cool. Other than helping to regulate internal temperature, mammal hair also has special qualities depending on the species. For instance, porcupine hairs are tipped with barbs as a means of defense against predators.Full Answer >