Bee Eater Bee-eater bird birding krayker plumage shiny beak bee eaters bill birds blue colour colourful green hunt insect meropidae merops apiaster nature nib orange tree yellow bee Blue Tailed bright feather gregarious migratory Near passerine sharp sky tail colorful eater merops philippinus perch wing Adaptation branch Coraciiformes Old World oriole Perching bird songbird wildlife