Black-winged vs. Black-shouldered kite?
Is the black-winged kite (E. caeruleus) different from a black-shouldered kite (E. axillaris)? Both names are listed on ebird checklists, but the Birds of Hong Kong and South China book only lists the black-winged kite. I could definitely benefit from an explanation. I'm 98% positive I saw one in Mai Po on Sunday.