why australia has animals not found anywhere else
Fauna of Australia The fauna of Australia consists of a huge variety of animals; some 83% of mammals, 89% of reptiles, 24% of fish and insects and 93% of amphibians that inhabit the continent are endemic to Australia.[2] This high level of endemism can be attributed to the continent's long geographic isolation, tectonic stability, and the effects of an unusual pattern of climate change on the soil and flora over geological time. A unique feature of Australia's fauna is the relative scarcity of native placental mammals. Consequently, the marsupials — a group of mammals that raise their young in a pouch, including the macropods, possums and dasyuromorphs — occupy many of the ecological niches placental animals occupy elsewhere in the world. Australia is home to two of the five known extant species of monotremes and has numerous venomous species, which include the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays. Uniquely, Australia has more venomous than non-venomous species of snakes.
Burmese pythons in Florida The Everglades is a region of subtropical wetlands comprising the lower third of the Florida peninsula. Only 25% of the original Everglades remains, protected within Everglades National Park (ENP). The climate of South Florida and the location of the Everglades, surrounded by a metropolitan area to the east, Naples to the west, and Florida Bay to the south, make it particularly vulnerable to infestations of exotic species. Miami, in particular, is the hub for trade in exotic pets within the United States. Although the exact origin of Burmese pythons in the Everglades is unknown, it is likely that many were once pets released by owners who found them too difficult to care for.[9] An evaluation of the genetic structure of Burmese pythons sampled from Everglades National Park determined that the population is genetically distinct from pythons sampled in the native range, but within the Everglades population, there is little genetic diversity. This finding either indicates that the python population is freely interbreeding or corroborates the hypothesis that the individuals originate from a specific source population such as the pet trade.[12]