Look at RioLink on Amazon. A variety choose from. Easy to use.
You might also consider a small fiber optic camera that can be put inside the bluebird box, for example, and watch their comings and goings.
They’re really fascinating.
Nice
Because of it being birds I am wondering whether there are like 4K resolution cameras? I see 3 and 4mps or 2K
is there a finer resolution?