Hey Klei, got a new suggestion for you!
Usualy when you generating a new world, there is a chance that you will get only one tallbird nest or two, like my current world, if you are not using server mod "Setpiece config" which gives 100% chance that your world will have a tallbird fortress. Usualy those tallbird nests are located in meteor field and there is a chance that meteor will hit it eventuly and burn last nest down, like in my prewious worlds. Then you no longer have any nests in your world, its not a huge deal to spawn one back using console commands, but i would love another way how to get a new nest. I know u can raise smallbird which is very hard, hard to keep him alive till he grows up. If you have hound traps and you are running from hounds, then its a big chance that you will kill small bird there aswell. Because you cant leave them inside closed pen and go far away, they will instantly teleported to you. So my first suggestion is, they should not teleport to a player if small birds are left offscrean. I think raising tallbirds is pointless, baby siting and feeding them for multiple days and after they grow up, they start attacking you. So my second suggestion is, if you raise smallbird to fully grown tallbird, it should create a new nest there 
Not sure if you read suggestions, but if you do, I hope you like this one and maybe someday use it!