In the order of PASSERIFORMES are birds like crows , finches , flycatchers, swallows, vireos , etc. . They are sometimes called " bird percheras " or " songbirds " . These birds are the most colorful and mysterious in the world. They are generally small to medium size , with long wings compared to their size. Present two interesting physical characteristics such as their overall vocal organ allows a wide variety of songs and calls , and specialized foot and leg , jump and move them to uniquely .
The PASSERIFORMES have three fingers located forward and one step back. This arrangement allows them to perch in various thin structures , such as branches , grasses , telephone wires and fences , feeders, or any object with narrow structures for perching .
The peak of the PASSERIFORMES varies greatly in size and shape depending on the diet of each species. Van of tiny , needle tip to catch insects, huge designed to break the hard shells of grains and seeds.