Remove the dead birds
it won't get rid of it but it will help with the putrid undertones of rotting carcass use BacaTec
Then you must somehow get rid of the corpse.
The Only Way To EVER Get The Smell Completely Out, Would Be To Find It. Call an exterminator to do the job.
A dead mouse can start to smell within a day or two of its death. The smell can linger for about a week or more, depending on the conditions such as temperature and ventilation. Proper removal and cleaning are essential to get rid of the smell effectively.
Ceiling fans are great to use outside above a patio, especially when barbequing. The fan can help get rid of the smoke or even blow the delicious smell to your jealous neighbors.
Have you considered a flame shooting gun, if they dont come out, you will at least know it is dead.
You can get rid of ants with ant killer. You may have to remove your ceiling fan so that you can get all of the ants.
First remove the dead squirrel, then clean up the area with bleach and water. next, spray some air freshner daily until smell seems to disapate....you may have to repeate the bleach and h2o process...
You take the bird out of the bird cage and pour in some boiling kettle water then clean it out when all the ants are dead and done with.Do not try with wood cages.Iron would be okay but I suggest steel.
Spray some Febreeze around in that house bro. From personal experience, I found it works very well.
Febreeze.
Glue everything to the ceiling