The Amazon is the way it was on earth after the flood after a few decades. Great diversity on a single acre. The amazon now is a remnant of that.
The amazon today is static but whefauna/flora first moved into virgin land life took off and filled every possible chance to survive. Species are just cousins or brothers and sisters who did so well they didn't need to mingle anymore. Included in this is a innate trigger that allowed all life to thrive.
Did these marsupials swim from Australia to the Amazon (South America)?
The Opossum Family
More than 60 different kinds of oppossums live in South America and 1 in North America, the Virginia opossum
didelphis virginiana. The name opossum is sometimes shortened to possum, which actually is the name for an Australian group of marsupials. These are distinct from opossums which are only found in North and South America. The Virginia opossum is probably best know for its last resort to escaping predators, "playing possum". As a last resort it can fake death to lose interest of its predator. The Virginia opossum is the only marsupial living in the wild in the US. They come in different shapes and sizes. They are marsupials meaning that they have a pouch in which they can carry their young. They all belong to the family
didelphidae.
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The grey short-tailed opossum is a small nocturnal marsupial found in South America. (Image: Paul Samollow, Southwest Foundation for Biomedical Research, San Antonio)
Shrew Opossum genus
Caenolestes (Photo courtesy of : nysm.nysed.gov)
The yapok, or water opossum (
Chironectes minimus), is the only true amphibious marsupial, living half its life in water and half on land. The female gives birth to 5 to 6 young. By tightening her muscles she makes her pouch waertight and take her babies swimming with her as she hunts for food in freshwater lakes and streams. The yapok has webbed back feet that paddle wih a running motion. Because its eyes are shut tight while it is under water, the yapok feels for soft
animals at the bottom of freshwater lakes and streams with its sensitive fingers.
The 7 species of shrew opossum live in the cool, misty forests of Andes Mountains in South America. They are the size of mice or rats. two long incisors (cutting teeth) stick froward from their bottom jaw and are used to stab the large insects and small
animals upon which they prey.
Thylacosmilus, a saber-tooth marsupial
that lived in South America during the Pliocene epoch, 1.6 to 5.3 million years ago
Thylacosmilus ("pouch sabre") was a
genus of sabre-toothed
marsupial predators that first appeared during the
Miocene. Remains of the animal have been found in parts of
South America, primarily
Argentina. It was not a relative of the true
saber-tooth cat, but rather a prime example of
convergent evolution.
Thylacosmilus had long, sabre-like upper canines and short, blunt, peg-like lower canines. The incisors were missing altogether and the other teeth were severely reduced, but, as distinct from
machairods, their number was complete.
[1]
Thylacosmilus' sabre-teeth kept growing throughout its life, unlike the sabres of true saber-tooths. It also had a pair of elongated,
scabbard-like flanges growing from the lower jaw, which protected the sabre-teeth when it closed its mouth. The cervical vertebrae were very strong and to some extent resembled the vertebrae of machairods.
[2]
It became extinct during the early
Pleistocene as a result of the
Great American Interchange, being outcompeted by true sabre-tooth cats such as
Smilodon.
Rob; the evidence will always show creationism to be nothing more than the crazy dreams of the indoctrinated fundamentalist.