If the earth was scorched by the meteor blast, and all the plants died because of the five year darkness, how did the dinosaurs which evolved into birds survive? (And the little ratty mammal ancestors)- had they built a special Dino shelter? Did the rats have lots of stores in the burrows….
I know a bit about this. Firstly it wasn't five years - probably less, and it would have gradually got lighter. Plants weren't completely eliminated (or we wouldn't have them now) - some trees would have survived, as well as dormant seeds and nuts. There was enough food for smaller animals (though they would have been competing for it and a lot of smaller species did die out too, as well as populations falling) - but bigger animals tended to suffer more because they need more food.
Dinos had already evolved into birds by this point - in fact long before. Lots of birds died out but a few mainly ground-dwellers/burrowers survivedto become today's birds. The other dinosaurs (that hadn't evolved into birds already) dies out.
There's some debate about why smaller dinosaurs died out too but it could be to do with them being reptiles and cold-blooded (if they were cold-blooded) bu there are other theories.
Burrows were a big advantage as they protected small burrowers from starving desperate predators, helped with staying warm, could store food etc.
After the dinosaurs/other giant reptiles died out and life recovered, there was a niche empty for bigger animals, so that's why we got big mammals like rhinos and whales.