Do You Think birds Have Fingers

yes three of them first the thumb supports a small but important part of the wing called the alula or bastard wing the second and third support the main flight feather.

WHY DO BIRDS KNEES BEND BACKWARDS?

they don't what looks like the birds knee is in fact its ankie and below it is an extended foot bone leading to the toes its real knee is usually hidden by feathers.

WHICH BIRD HAS THE LONGEST WINGS?
the wandering albatross has a wingpan the distance from one wingtip to the other when the wings are stretched out of more than three metres the longest ever measured was a male with a wingspan of 3.45 m (5 feet) females are usually smaller

img source: http://doutoraresponde.blogspot.com/2009/01/posies-do-stj-sobre-caso-fortuito-e.html

Thanks You! Maraming Salamat po!