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It's to long to fit in the title, but the question is that now that the earth is warming up animals will grow larger and that the now "extinct" species such as the Dire Wolf and Arcttodus will return, and we will go through another pleistocene era?
Is that a normal observation or thought?
Extinct species will never return.
If we continue on the path we're on, humans (Homo sapiens sapiens) will become another of a long list of extinct species.
It is true, that given enough time, and a suitable environment, new species will evolve to fill a vacated niche.
Interesting thought though I wonder if anything could make it with the humans populating every nook and cranny of the planet.
It has been shown that when the temperature of the climate gets hotter, that things tend to grow be them plants, insects, or even piranha. Why that is, I forget. But in my life time, so far, I have this happen personally with insects. The most commonly being "giant" bees, for some reason.
As for whether or not previously creatures shall return, I don't know. I don't think that the truly extinct ones will.
the only way (without human or alien intervention) that an extinct species could return is if a current decendant evolves back into that animal. more than likely, the new species may only share some traits with the exinct one, or something completley different.
and animal growth? maybe some will become bigger, but according to natural selection, the environment would have to be better suited to the larger individuals of a species and against the smaller ones. if so, eventually, they would probably be bigger.
Animals grew large when the earth was still warm, as soon as we go extinct, I feel they won't exactly return, but the extant animals will grow.
It's an interesting thought although suckonthis is right and extinct species will never return except in the case of Jurassic Park type conditions.
Certainly can't be classified as normal but this is the kind of thinking that we find in very intuitive people, so be happy about that.
never has there been a case of re-evolution.
but the big animals--> small animals goes in cycles right now we have just started leaving a big animal period (mammoths, dire wolfs,wolly rinos, elephant birds ecc) we still have "plenty" of big animals (elephands,buffalo,tigers rino ecc.) all unfortunatly endagerd.
the reason that animals get big is not quite known . they evolve well after Earth's recovery from a mass extinction.
so by the looks of it we are hedding that way, and for the first time the exctinction is caused by one species and in a different way so we can't predict what will happen next.
also like I said if big animals (megafauna) evolve again the will never evolve again the same way, some thing new will come.
but our elephants,rino,lions,tigers,bison and buffalo we know and love once lost will never live again.
(or your dire wolves for that matter)