I have purchased a Canon 7D that has audio with its HD Video. But it can be slightly improved with the gear below. Note however that the VideoMic will not transform your sound recording in leaps and bounds. You most likely need a parabolic reflector for that.
The workflow cannot be easier. I mount the mic on my camera to avoid handshake induced noise. I then record the bird sounds. The Olympus unit has a fantastic battery life and can record more than 11 hrs of Wav!
Note however that with a Canon 7D you don't need the Olympus recorder, but you can simply plug the mic directly into the camera.
Bird Sound Recordings
If the page doesn't have the speaker icon then go and look for the recording at one of these great sites:
Doug Von Gausig have shared his expertise of different sorts of sound equipment, and recording techniques on his site Naturesongs
Bluebill is an app that is linked to recordings on xeno-canto. The app has to download the sound file so use it wisely. Unfortunately it feels half made. Maybe because it is trying to do too much, and not only make the bird sounds available in an easy way. KISS - Keep It Simple Silly... At least this one is freeware (and no fees when donwloading the soundfiles in a WiFi setting).
There are also lots of other apps, epecially those you purchase that are even easier, more complete and better to use.