Description
All the warblers are fairly small. The smallest species is the Lucy's Warbler (Oreothlypis luciae), at about 6.5 grams and 10.6 cm (4.2 in). The largest species depends upon the true taxonomy of the family. Traditionally, it was listed as Yellow-breasted Chat, at 18.2 cm (7.2 in). Since this may not be parulid, the Parkesia waterthrushes, the Ovenbird, the Russet-crowned Warbler and Semper's Warbler, all of which can exceed 15 cm (6 in) and 21 grams, could be considered the largest.
The migratory species tend to lay larger clutches of eggs, typically up to six, since the hazards of their journeys mean that many individuals will have only one chance to breed. In contrast, two eggs is typical for many tropical species, since the chicks can be provided with better care, and the adults are likely to have further opportunities for reproduction.
Many migratory species, particularly those breeding further north, have distinctive male plumage at least in the breeding season, since males need to reclaim territory and advertise for mates each year. This tendency is particularly marked in the large genus Dendroica. In contrast, resident tropical species, which pair for life, show little if any sexual dimorphism. There are of course exceptions. The Parkesia waterthrushes and Ovenbird are strongly migratory, but have identical male and female plumage, whereas the mainly tropical and sedentary yellowthroats are dimorphic. The Granatellus chats also show sexual dimorphism, but due to recent genetic work have been moved into the family Cardinalidae (New World buntings and cardinals).
Read more about this topic: New World Warbler
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