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Even the common swift can cruise at a maximum speed of 31 metres per second (112 km/h; 70 mph). In a single year the common swift can cover at least 200,000 km, [8] and in a lifetime, about two million kilometers. [9] The wingtip bones of swiftlets are of proportionately greater length than those of most other birds.
Bird measurement or bird biometrics are approaches to quantify the size of birds in scientific studies. The variation in dimensions and weights across birds is one of the fundamental sources of diversity among birds, and even Within species, dimensions may vary across populations within species , between the sexes and depending on age and ...
Common Swift chicks . The common swift (Apus apus) is a medium-sized bird, superficially similar to the barn swallow or house martin but somewhat larger, though not stemming from those passerine species, being in the order Apodiformes.
The white-chested swift is 14 to 15 cm (5.5 to 5.9 in) long and weighs about 28 g (0.99 oz). Both sexes have a notched tail, with the male's notch being deeper.
The largest bird of all time was likely the elephant bird Aepyornis maximus, which was estimated to have weighed 275–1,000 kilograms (610–2,200 lb) and stood at 3 metres (9.8 ft) tall. [4] [5] The largest wingspan of all time likely belonged to Pelagornis sandersi at roughly 5.2 m (17 ft). [6]
These 113 species of swifts (family Apodidae) are recognized by the International Ornithological Committee (IOC). They are distributed among four tribes and 19 genera. [1] [2] However, the family's taxonomy is not settled.
Most Apus swift species nest in rocky areas, and the majority will accept human habitations as a substitute for natural sites. The Pacific swift is a colonial species that nests in sheltered locations such as caves, crevices in vertical rock faces (including sea-cliffs), or under the eaves of houses. The nest is a half-cup of feathers, dry ...
This is a small swift, even compared to other Chaetura species, at 10.7 to 11.2 cm (4.2 to 4.4 in) long and weighing 18 g (0.63 oz). The northern populations are slightly larger at 11.5 cm (4.5 in), probably according to the Bergmann's Rule and/or migration requirements.