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The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus) [40] but this is a great deal smaller than the largest amphibian that ever existed—the extinct 9 m (30 ft) Prionosuchus, a crocodile-like temnospondyl dating to 270 million years ago from the middle Permian of Brazil. [41]
Goat kids will stay with their mother until they are weaned. Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2]
They have short vertebral columns, with no more than 10 free vertebrae and fused tailbones (urostyle or coccyx). [47] Frogs range in size from Paedophryne amauensis of Papua New Guinea that is 7.7 mm (0.30 in) in snout–vent length [ 48 ] to the up to about 35 cm (14 in) and 3.3 kg (7.3 lb) goliath frog ( Conraua goliath ) of central Africa ...
The temnospondyl Eryops had sturdy limbs to support its body on land Red-eyed tree frog (Agalychnis callidryas) with limbs and feet specialised for climbing Japanese giant salamander (Andrias japonicus), a primitive salamander The bright colours of the common reed frog (Hyperolius viridiflavus) are typical of a toxic species Wallace's flying frog (Rhacophorus nigropalmatus) can parachute to ...
A mammal in which males remain as care helpers. [10] Male mammals employ different behaviors to enhance their reproductive success (e.g. courtship displays, mate choice). However, the benefits of paternal care have rarely been studied in mammals, largely because only 5-10% of mammals exhibit such care (mostly present in primates, rodents and ...
Among mammals, marsupials and most rodents are altricial. Domestic cats , dogs , and primates , such as humans , are some of the best-known altricial organisms. [ 14 ] For example, newborn domestic cats cannot see, hear, maintain their own body temperature, or gag , and require external stimulation in order to defecate and urinate. [ 15 ]
Mammals are a class of vertebrates that contain mammary glands which secrete milk that nourishes their offspring. This maternal behavior is unique from all other vertebrate classes. The basic maternal care patterns in mammals involve the internal incubation during gestation, the delivery of young, and maternal care until the young are weaned. [5]
Synapsida [a] is one of the two major clades of vertebrate animals in the group Amniota, the other being the Sauropsida (which includes reptiles and birds).The synapsids were the dominant land animals in the late Paleozoic and early Mesozoic, but the only group that survived into the Cenozoic are mammals. [7]