a tree swallow in alaska perched on a metal pole

passeriformes chordata animalia hirundinidae fields wetlands alaska acrobatic flight large flocks aerialist american animal aves avian beak berry eating bird watching birding blue bug eater colorful feather fence post insect iridescent marsh migration migratory nature ornithology passerine perch perched perching songbird spring springtime swallow tachycineta bicolor tree wildlife wings