Female Grebe bird sits on nest in marsh pond, male adds grass to nest

grebe bird nest female male pair animal marsh pond grass aquatic wetland water nature wildlife wild mate birdwatching ornithology natural outdoor surface waterfowl fowl crested blacknecked build swim float lake habitat fauna copy space avian waterbird aquatic bird podiceps nigricollis podiceps nigricollis breed eared grebe plumage feather beak bill construct reflect vegetation migratory