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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.

Approximately 65 million years ago, a mass extinction occurred on planet Earth. Layers of soil dating back to this time contain large amounts of the radioactive element iridium. This indicates that a large asteroid or comet struck Earth, throwing up huge clouds of debris, which would block much of the sunlight. Food became very scarce. Half of the marine species and nearly all of the dinosaur species went extinct during this time. Soon after the cloud settled, the surviving species of mammals rapidly diversified and filled the niches left empty by the dinosaurs. What evolutionary event was represented by this asteroid collision and the resulting cloud?
a. mutation
b. gene flow
c. genetic drift
d. natural selection
Thanks!