Homo sapiens human Facebook. Kingdom Animalia animals. Animalia: information 1 Animalia: pictures Animalia: specimens Animalia: sounds Animalia: maps Eumetazoa metazoans. Eumetazoa: pictures Eumetazoa: specimens Eumetazoa: sounds Eumetazoa: maps Bilateria bilaterally symmetrical animals. Bilateria: pictures Bilateria: specimens Bilateria: sounds Bilateria: maps Deuterostomia deuterostomes. Deuterostomia: pictures Deuterostomia: specimens Deuterostomia: sounds Phylum Chordata chordates.
Chordata: information 1 Chordata: pictures Chordata: specimens Chordata: sounds Craniata craniates. Craniata: pictures Craniata: specimens Craniata: sounds Subphylum Vertebrata vertebrates. Vertebrata: information 1 Vertebrata: pictures Vertebrata: specimens Vertebrata: sounds Superclass Gnathostomata jawed vertebrates.
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In the case of both reptiles and birds, the eggs are fertilized within the reproductive tract of females. There are other striking similarities between reptiles and birds in their anatomies and reproductive systems. This is not surprising because birds are descendents of theropod dinosaurs two-legged mostly carnivorous dinosaurs.
Birds class Aves Dogs, cats, bears, humans and most other large animals today are members of the vertebrate class Mammalia. All mammals conceive their young within the reproductive tract of the mother and, after birth, nourish them with milk produced by their mammary glands. Mammals are heterodonts with strong jaws. That is to say, they have a variety of specialized teeth incisors, canines, premolars, and molars. This allows them to chew their food into small pieces before swallowing it.
Subsequently, they can eat any size plant or animal. Many reptiles must swallow their prey whole, which limits them to hunting smaller game. Like birds, mammals are endothermic , or warm blooded. They are able to maintain a relatively constant body temperature regardless of external environmental conditions mainly by using internal physiological mechanisms.
In other words , they are homeothermic , or stable in core body temperature, as a result of endothermy. All of the living species of insects, fish, reptiles, and amphibians are ectothermic , or cold blooded. They keep their body temperature in a normal range mainly by avoiding exposure to environmental temperature extremes.
For instance, reptiles usually remain in shaded areas on hot days to prevent fatal overheating. On cold nights, their lowered body temperature can cause them to become sluggish and inactive. In contrast, endothermic animals are able to remain active at night and often in the winter when the air temperatures are especially cold.
Humans, however, also possess many unique characteristics and are therefore classified within a unique subgroup of the Great Apes called the hominins.
The Australian Museum respects and acknowledges the Gadigal people as the First Peoples and Traditional Custodians of the land and waterways on which the Museum stands. Image credit: gadigal yilimung shield made by Uncle Charles Chicka Madden. This website uses cookies to ensure you get the best experience on our website. Learn more. Mammal diversity The first mammals evolved about million years ago.
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