It's spring here and the birds are singing - but sometimes you just don't want them in your recordings ... so my question to you is what are your tricks for getting rid of those birds in your recordings?
-> Wait till winter haha!
As a sound recordist, you need to plan your records over the year. You can't expect to go out in summer to make some snow records (here in switzerland you can, you have to go up to 4000 meter) or also you can't expect to got to a air show, record some great air-plane loopings without having all the stupid crowd and PA's on it. I made all this experiences! But for the Air-show, I realized that if I go 1km left or right you have a great place without people and the aircraft needs space and also pass you beside the runway.
Tools like RX2 or other plugins are (from my point) of view surgical tools and makes lot's of artefacts and should only be used last. Think about how large you need to rise the levels if you want to put out birds! RX2 is a tool, not a solution.
Here are some way's to make records without birds or bugs.
Summertime: Depending on your location, summer is ok to record birds, cricket and in switzerland cowbells. This starts from april to september. In this time, you can forget making clean records.
November-Feb: birds are away, bugs are dead, it is silent
Daytime: from 6.00-23.00: Airtraffic: a horrible problem for us recordists. Forget making records in a circle from 100km around an airport.
Nighttime: No other folks, no birds, great for recording
Sunday: Is great to make records, no construction works, but lot's of people -
Make the test: try to make a good record from a train stops/depart at the station without people on the record. Rushour is probably not the best time to do it.
So: It's always worth to think/plan before recording, it safes lot's of time and frustrations.
iZotope RX 2:
Wait till winter haha!
In all seriousness though, Internet Human's suggestion is a good one. RX2 is an incredible piece of software and brilliant for fixing problems where you can't re-record sounds.
I've come across the same problem here in the last few days, and I've decided to record my source at night. If you're about to record rather than trying to fix already recorded sounds, then I'd keep going back to your location and find the quietest time (or take an educated guess and turn up). If it's not viable to record/re-record, RX2 is the way to go.
You can try Sonic No Noise or Waves WNS- both are pretty and not too pricy compared to something like the Cedar.
iZotope RX2 and Adobe Audition have spectral healing powers. You can lasso birds out.