Below are binoculars that have been give a 5 Star Birdwatching Binoculars rating from Best Binoculars.
For bird watching, the most popular binocular sizes are 8x40 and 8x42. This is mostly because binoculars with these specifications are compact enough to carry with you, whilst still large enough to gather plenty of light enabling you to view birds in shady wooded areas. A wide field of view is also important as this will allow you to track quick flying and moving birds in trees as well as allowing you to see more individuals at a time when counting or observing large flocks or groups. A good depth of field helps so you don't need to keep adjusting the focus to keep a small bird in focus. Follow this link for my in depth article on Birdwatching Binoculars
