European Bee-eater (Merops apiaster) pair perched on sand bank at nest hole, Bulgaria

vertebrates bee eater sandbank bulgaria birds bird animals insectivore pair colourful eastern european eastern east bee eaters nest european sand behaviour wildlife eastern europe nature bank coraciiformes vertical aves bulgarian meropidae east europe insectivorous zoology merops breeding bird color east european vertebrate developed countries developed country european hole apiaster verticals meropidae europe sandbanks animal europe