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More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
The World's 100 most threatened species [1] is a compilation of the most threatened animals, plants, and fungi in the world. It was the result of a collaboration between over 8,000 scientists from the International Union for Conservation of Nature Species Survival Commission (IUCN SSC), along with the Zoological Society of London . [ 2 ]
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While the animals in the Amazon are often larger than life, this South American rainforest region have some of the world’s smallest creatures
This is a collection of lists of mammal species by the estimated global population, divided by orders. Lists only exist for some orders; for example, the most diverse order - rodents - is missing. Much of the data in these lists were created by the International Union for Conservation of Nature (IUCN) Global Mammal Assessment Team, which ...
Fungi are also very common in rainforest areas as they can feed on the decomposing remains of plants and animals. The great diversity in rainforest species is in large part the result of diverse and numerous physical refuges , [ 25 ] i.e. places in which plants are inaccessible to many herbivores, or in which animals can hide from predators.
In the animal kingdom, there is general consensus that Brazil has the highest number of both terrestrial vertebrates and invertebrates of any country in the world. [8] This high diversity of fauna can be explained in part by the sheer size of Brazil and the great variation in ecosystems such as Amazon Rainforest, Atlantic Forest, Cerrado, Pantanal, Pampas and the Caatinga.