asked in Animals+Birds by (57 points) 2 10 23

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answered by (299 points) 1 12 22
The National Geographic has actually answered this question in an article written by Liz Langley. It was mentioned in the article that Samantha Hopkins, an associate professor of geology at the University of Oregon, said that the two mammals that have undergone the fewest evolutionary shifts are the platypus and the opossum. Skulls of the platypus-like ancestors have been found dating back to the Cretacious period (63 million to 138 million years ago). On the other hand, a 2009 study published in the PLOS ONE journal traces the opossum lineage back to a sister group of marsupials called the peradectids, which lived at the time of dinosaur extinction in the Cretaceous-Paleogene period.
You can check the entire article in this website:
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answered by ELITE (3,221 points) 5 12 23
There are just a handful of animals that have barely revolved from their original form since they first appeared on earth. If we were to list these animals in a ranking formation, one particular reptile is worth mentioning and will most likely take the lead. Am referring to the crocodiles.
Crocodiles along with pterosaurs and dinosaurs were among the offshoot of archosaurs, the ruling lizards of the early Jurrasic to middle triassic periods some 65 million years ago. As you already know, every known animal from that period has either gone extinct or revolved to several different species scattered around the earth. The crocodile chose to remain the same till date. The only major difference discovered from today's crocodiles and those of the jurrasic period are the shape and musculature of their jaws, which tend to be more deadly, as well as their relatively splayed limbs-as opposed to the straight locked in legs of those from the jurrasic period. Asides this, nothing else has changed in the crocodile, it's brain is still as small as the size of a golf ball. Or perhaps, the brain size is the reason why it's unable to revolve. No matter it's reason for not evolving much, the crocodile takes the lead on this subject as it's over 65million years old.
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answered by ELITE (3,094 points) 3 6 14
I think there are many animals that have survived longer till date without evolving.  Some of those animals animals that have not evolved much are crocodilians; presence from cretaceous period to present. and others are, birds;   present from Triassic period to present. Millipedes; presence from Silurian period to. Present. Turtles: presence from Triassic period to present. Snakes: presence from Cretaceous period to present. Cats; presence from Paleogene period to present. Sharks: presence from silurian period to present. Lizard; presence from Triassic period to present. Dog: presence from Eocene Epoch to present. Bears: presence from Eocene Epoch to present. Rhinos: presence from Oligocene Epoch to present. Primates:presence from Paleogene period to present.

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