Varied Tit Bird Pecking Acorn in Autumn Forest Ground

varied tit peck acorn bird sittiparus varius eat feed autumn ornithology behavior avian south korea one closeup colorful fallen leaves beak bill perched front view hold claws legs grass moss brown feather plumage details close up black nape japan ecosystem environment food wildlife veried titmouse tit nut environmental ecology autumn leaf november autumnal detail eating