Else where in thread someone said 100 mw/cm^2. Not great, not terrible. Maybe 1/5 of putting bird in a microwave. Cooking time would be long but you may be able to get it to work

Frankly, I have concerns about birds. Insects are sub wavelength, so they won't be impacted, or at least the impact won't be obvious.

But the birds moving around...

Guess we shall see. That's what field tests are for.