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I’m planning to write a post-apocalyptic story about the adventures of animals living after humanity destroys itself in a nuclear war. I’ve decided to have many of the general groups of invertebrates, amphibians, and reptiles survive in my story, but I’m having more trouble deciding on what types of fish, birds, and mammals would live.
The fish that I decided that I would use so far are the ones like lobe-finned fish, sharks, rays, jawless fish, seahorses, and mummichogs, but I can’t think of much else, because don’t know the exact nature of the impact that an event like this would have on modern marine life. With mammals I’ve got species like rodents, shrews, bats, pigs, wolves, and honey badgers, but again, I’m stuck. Birds are the ones that are giving me the most trouble, crows are actually the only birds that I’ve really decided on so far. So what other kinds of birds are likely to be post-apocalyptic survivors?
Also, what types of animals would likely evolve to replace large land predators if those were to go extinct? It’s just that I once read an old speculative biology book about how animals may evolve 50 million years in the future, and it had rats replace the large predators, but I also read on the Internet that there were more likely candidates to fill in that niche, but I don’t know exactly which.

I came up with a very off the wall idea
Introduction of cheetahs into Australia.
I thought of it because the niche that cheetahs fall into isn’t really filled here. We don’t have any large land predators and it seemed at first glance that they might do well here without competition.
I’d like you guys to imagine this hypothetical situation.
think about what kind of consequences it might have.
and
how would they fair in our environment?
would they be able to live and breed in the wild?
what part of Australia would be ideal what part would not be.
what prey would they choose?
how would they impact the other animals here and in what ways.
would they compete with other feral animals?
and which animals would be most affected
how would a wild population of cheetahs affect the people and farmers. would they become a problem or leave them alone do you think?
whatever else you can think of.