• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
Feel the intensity, not your equipment. Maximum image quality. Minimum weight. The new ZEISS SFL, up to 30% less weight than comparable competitors.

Search results

  1. J

    Eastern Buzzards: what determines the width of the dark trailing edge of underwing?

    Darker individuals have broader trailing bands on average, but more importantly, adults have those broader than first years. And both refectus and japonicus have those narrower than vulpinus, when comparing the corresponding age classes. Ageing is very important in this case.