Another option is with the new Sony Spectral Layers program. I was able to remove from an entire half hour program all the cricket chirping sounds and leave my voice and even the birds that were chirping in the background.
I haven't figured out all the nuances with it yet but it can do wonders.
Here's a tutorial about it.
http://www.sonycreativesoftware.com/spectralayersintrowebinar
Izotope I think can only remove about 4 seconds of unwanted audio at a time. Spectral Layers can remove unwanted sounds from an entire long program.
Roger Bansemer