zosterops japonicus, foragers weaving through the barley field

courtship crisp dependence ecological ecology eggs environment farmland feathers field fields flight flock flower food foragers foraging grass growth habitat herbaceous hordeum insect invertebrate lawn leaf low meadow migration migratory movement natural nest nesting perching plant plants plumage population prairie predation predators prosperity resident roosting searching seasonality shrubs singing sky social soil source summer swift tail undefined vitality vulgare waterbird weaving wetland wildlife wind wings wingspan winter world yellowgreen zosterops