pycnonotus sinensis on the treetops

aerial autumn bait beak behavior biodiversity bird birds branches breeding canopy chick claws colony community conservation distribution ears ecology ecosystem eggs environment environmental ethology eye eyes feathers feeding female flock foliage food foraging forest growth habitat height horizontal journey leaves male marking migration nature nest nesting nestling nests observation organism ornithology pecks perch population protection pulsatilla reproduction reproductive routes science sight sound species spring summer survival swarm tail thrush trunk wings winter woods