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Amphibians have soft bodies with thin skins, and lack claws, defensive armour, or spines. Nevertheless, they have evolved various defence mechanisms to keep themselves alive. The first line of defence in salamanders and frogs is the mucous secretion that they produce. This keeps their skin moist and makes them slippery and difficult to grip.
Scientists found that members of the new species are smaller than their offshore common bottlenose counterparts, eat different fish and have spines adapted to navigating the tight spaces of rivers ...
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 ...
Hatching takes place after 10 days of gestation; the young echidna, called a puggle, [23] [24] born larval and fetus-like, then sucks milk from the pores of the two milk patches (monotremes have no teats) and remains in the pouch for 45 to 55 days, [25] at which time it starts to develop spines. The mother digs a nursery burrow and deposits the ...
Marine vertebrates also have a far more centralized nervous system than marine invertebrates, with most of the higher functions cephalized and monopolized by the brain; and most of them have evolved myelinated central and peripheral nerve system, which increases conduction speeds significantly.
For instance, descendants of the first reptiles include modern reptiles, mammals and birds; the agnathans have given rise to the jawed vertebrates; the bony fishes have given rise to the land vertebrates; a group of amphibians, the labyrinthodonts, have given rise to the reptiles (traditionally including the mammal-like synapsids), which in ...
Amazing Animals (sometimes marketed as Henry's Amazing Animals for home video) is an educational children's animated TV show series nature program produced by Dorling Kindersley Vision and Partridge Films in association with the Disney Channel. [1] It was originally broadcast on the service in 1996. It also aired on Family Channel in Canada. It ...
Temnospondyli (from Greek τέμνειν, temnein 'to cut' and σπόνδυλος, spondylos 'vertebra') or temnospondyls is a diverse ancient order of small to giant tetrapods—often considered primitive amphibians—that flourished worldwide during the Carboniferous, Permian and Triassic periods, with fossils being found on every continent.