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In many cases, passerine families were grouped together on the basis of morphological similarities that, it is now believed, are the result of convergent evolution, not a close genetic relationship.
Some passerines, specifically in the family Ploceidae, are well known for their elaborate sexual ornaments, including extremely long tails. The chicks of passerines are altricial: blind, featherless, and helpless when hatched from their eggs. Most passerines lay coloured eggs, in contrast with nonpasserines, most of whose eggs are white except in some ground-nesting groups such as Charadriiformes and nightjars, where camouflage is necessary, and in some parasitic cuckoos, which match the passerine host's egg.
Vinous-throated parrotbill has two egg colours, white and blue.
Sometimes known as perching birds or, less accurately, as songbirds, the passerines form one of the most diverse terrestrial vertebrate orders, with over 6,000 identified species.
It has roughly twice as many species as the largest of the mammal orders, the Rodentia.
The heaviest and altogether largest passerines are the thick-billed raven and the larger races of common raven, each exceeding 1.5 kg (3.3 lb) and 70 cm (28 in).
The superb lyrebird and some birds-of-paradise, due to very long tails or tail coverts, are longer overall.
This enables passerines to sleep while perching without falling off.
Certain species of passerines have stiff tail feathers, which help the birds balance themselves when perching upon vertical surfaces.
It contains more than 110 families, the second-most of any order of tetrapods (after Squamata, the scaled reptiles).Tags: Adult Dating, affair dating, sex dating