A Field Guide to the Nests, Eggs, and Nestlings of North American Birds

adults Altricial and downy areas bark Begins early Begins late April bill birds blackish blackish-brown Breeding season brooded buff buffish cavity conifer creamy-white dark brown deciduous double-brooded early June egg color varies eggs are smooth Eggs laid feathers greenish ground hair hatching herbage HUMMINGBIRD Incubation Incubation by female June in north Kittlitz's Murrelet larger end lichen lined with finer long subelliptical male markings moderately glossy moss mottled Nest usually Nestling period Noddy Tern north of range olive pale gray paler parents plant material plant stems Precocial and downy purple rarely Razorbill reddish-brown rootlets Rose-throated Becard sexes short subelliptical shrub Single-brooded slightly glossy Smooth and glossy Smooth and non-glossy Smooth and slightly sometimes 3-5 sparse species speckled spotted and blotched streak Subelliptical to short tended by female tips tundra unmarked Usually 4-5 variable Vireo Warbler weed stems woodland Xantus's Murrelet Young leave nest Young tended