In regards to the climate, with the length of time that passes before the teams get activated and are potentially encountering these animals, the climate may very well have shifted to something more favourable to the animals.
Either that or the animals themselves have started evolving to fit in with the climate. A few hundred years gives plenty of time for some of these species to start adapting.
For example, the average lifespan for a lion in the wild is 10-15 years. Even in just one hundred years, that's about six to nine generations.
Looking at what's happened in the Chernobyl Exclusion Zone, some animals have grown to quite large sizes in a relatively short time because there's no humans to prey on them. The same sort of thing could happen with TMP, very few humans to interfere with the animals coupled with a larger area to grow in, some species could potentially become larger than expected (excluding natural predation).
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