This giant extinct echidna weighed about 30 kg and stood around one metre tall (about the size of a sheep) making it the largest monotreme (egg laying mammal) to have ever lived. Zaglossus hacketti was an ancestor of the echidna, and was about a yard long. Zaglossus hacketti is an extinct species of long-beaked echidna from Western Australia that is dated to the Pleistocene. Zaglossus hacketti . It had longer, straighter legs than any of the modern echidnas. Like many of Australiaâs prehistoric megafauna, zaglossus hacketti disappeared around 12,000 years ago, perhaps because of human encroachment. Zaglossus hacketti was unknown to science until it was first identified from the Mammoth Cave fossil deposit in 1909. Gigantic Long Beaked Echidna (Zaglossus hacketti) This particular Echidna lived during the Upper Pleistocene era which was millions of years â¦ Around 40 million years ago, North America was home to entelodonts, the carnivorous ancestors of hippopotamus who looked like pigs. 1914. â¦ Taxonomy and detailed description of Zaglossus hacketti. It was about 1 meter long and probably weighed about 30 kg (66 lb). Long-beaked Echidna (Zaglossus bruijni), is from New Guinea. Haast's Eagleâ â¬/â â¬Pouakai (Harpagornis moorei, Hieraaetus moorei,â â¬possibly Aquila mooreiâ)This illustration is available as a printable colouring sheet (pre-orientated in portrait for easier printing). Marsupials (Marsupialia) The largest-known marsupial is the extinct Diprotodon, about 3 m (9.8 ft) long, standing â¦ Most significantly, many of the species represented are megafauna. 9. Toggle Caption. 10. Other Articles you Might Like Liked it? Recent evidence suggests that the human Belongs to Zaglossus according to M. L. Augee et al. Zaglossus hacketti is an extinct species of long-beaked echidna from Western Australia that is dated to the Pleistocene.It is known only from a few bones. Further evidence found in cave paintings, which depict creatures similar to Zaglossus hacketti, place both it and humans in the same timeframe. A Short Beaked Echidna is pictured with its snout to the surface of a wet rock. Why were they here and nowhere else? Full reference: L. Glauert. It was about 1 m long and probably weighed about 30 kg (66 lb). Its spines are yellow with a black tip, whilst its snout appears to be a bluish-brown colour. 2006. The echidna is an oval shape, with a ball-like appearance. The reason the megafauna became extinct has been debated for many years with two main possibilities arising; climate change and/or the impact of the first humans. It is known only from a few bones. Unfortunately for other Australian animals, like the giant long-beaked echidna (Zaglossus hacketti), we have found only scant evidence. Around three feet (1 metre) long, this ancient species of long-beaked echidna lived in Western Australia during the Pleistocene era. Monotremes (Monotremata) The largest-known monotreme (egg-laying mammal) ever was the extinct long-beaked echidna species known as Zaglossus hacketti, known from a couple of bones found in Western Australia.It was the size of a sheep, weighing probably up to 30 kg (66 lb). They are sometimes called âterminator pigsâ or âhell pigsâ. Previous Article 10 Facts â¦ Records of the Western Australian Museum 1(3):244-248. This makes it the largest monotreme known to have ever lived. Take a second to support Toptenz.net on Patreon! Indeed, for some of the extinct megafauna, scientists have found over 2,500 fossils.