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Echidnas and platypuses are the only egg-laying mammals, the monotremes. The average lifespan of an echidna in the wild is estimated at 14–16 years. Fully grown females can weigh about 4.5 kilograms (9.9 lb), the males 33% larger, at about 6 kilograms (13 lb). [12]
Short-beaked echidnas are typically 30 to 45 cm (12 to 18 in) in length, with 75 mm (3 in) of snout, and weigh between 2 and 7 kg (4.4 and 15.4 lb). [23] However, the Tasmanian subspecies, T. a. setosus , is smaller than its Australian mainland counterparts. [ 24 ]
The long-beaked echidna's limb posture is sprawled, similar to extant reptiles like lizards and crocodilians. Although the stances between the animal groups are similar, the way the limbs move are very different between the clades. The echidna swings its limbs at a 45 degree angle while a lizard's is more horizontal.
The western long-beaked echidna is an egg-laying mammal. Unlike the short-beaked echidna, which eats ants and termites, the long-beaked species eats earthworms.The long-beaked echidna is also larger than the short-beaked species, reaching up to 16.5 kilograms (36 lb); the snout is longer and turns downward; and the spines are almost indistinguishable from the long fur.
The eastern long-beaked echidna can be distinguished from other members of the genus by the number of claws on the fore and hind feet: it has five claws on its fore feet and four on its hind feet. Its weight varies from 5 to 10 kilograms (11 to 22 lb); its body length ranges from 60 to 100 centimetres (24 to 39 in); it has no tail.
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Echidna nocturna has a long snake-like body with an average vertebral count of 120.4 vertebrae. [4] The average length of an adult eel is 48.26 cm. [3] Juveniles range in size from 8.52 cm to 35.48 cm with the average length being 22 cm. [5] They weigh between 1.12g and 296.1 g with the average weight being 49.62 grams. [5]
It is the smallest member of the genus Zaglossus, being closer in size to the short-beaked echidna (Tachyglossus aculeatus). The weight of the type specimen when it was alive was estimated to be 2 to 3 kilograms (4.4 to 6.6 lb). [5] The male is larger than the female, further differentiated by the spurs on its hind legs.