I have not thought about this in years. I changed to raw almost immeditaly after I started shooting birds. And I knew there was a reason.. LOL
1: The detail in jpeg is very poor.
2: If you shoot raw only you have a perfect jpeg conversion from raw. Just no reason to shoot any jpeg what so ever, for birding.
3: You loose the raw processing. Just a loose loose situation in birding.
This first pic if shot in raw. Would have beautiful plumage detail. Just a wast of time really. It looks nice but is extremely bad by my standards.
Click on the bird for a larger view. You can see the extremely poor detail.
JUST don't do it. Get a good conversion engine with good tools for enhancing a photo, or convert with the software supplied with your camera. Actually the software supplied with your camera will do a very good job and has tools available to do simple enhancing.
It will take you to a new level.. And more important I think. It will show your work the best it can be. Whether in a small photo or a large print.
Go birding it is fun and great exercise.