Tetrapods
Viviparous
Bringing forth living young rather than eggs, as most mammals and some reptiles and fishes.
Endothermic
Warm-blooded
Exothermic
Cold-blooded
Aves
A class of vertebrates comprising the birds.
Pinnipedia
A group of semi-aquatic marine mammals that include sea lions, fur seals, true seals and the walrus.
Dive Reflex
A reflex in mammals which optimizes respiration to allow staying underwater for extended periods of time.
Sirenia
An order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters.
Cetacea
An order of marine mammals that comprises the whales, dolphins, and porpoises.
Tetrapod
Any vertebrate having four limbs or, as in the snake and whale, having had four-limbed ancestors.
Myoglobin
Hemoglobin of muscle, weighing less and carrying more oxygen and less carbon monoxide than blood hemoglobin.
Ovoviviparous
Producing eggs that are hatched within the body, so that the young are born alive but without placental attachment, as certain reptiles or fishes.
Oviparous
Producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.
Mammalia
The class comprising the mammals.
Reptilia
The class comprising the reptiles.
Migration
To pass periodically from one region or climate to another, as certain birds, fishes, and animals.