flock of sandhill cranes at bernardo national wildlife refuge

abundant alert area avian avifauna basin beak beauty bernardo biology bird birding birdwatching canadensis cranes ecology environment feathers feeding flock grande gray group grus horizontal large legs long management mexico middle migratory multiple natural nature new nobody ornithology outdoors overwintering people protection red refuge rio sanctuary sandhill socorro stopover tourism travel viewing waterfowl white wildlife wintering