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addled eggs Also, wind eggs; hypanema. [5] Eggs that are not viable and will not hatch. [6] See related: overbrooding. afterfeather Any structure projecting from the shaft of the feather at the rim of the superior umbilicus (at the base of the vanes), but typically a small area of downy barbs growing in rows or as tufts.
Flying birds have different wing and feather structures that make flying easier, while flightless birds' wing structures are well adapted to their environment and activities, such as diving in the ocean. [21] Species with certain characteristics are more likely to evolve flightlessness.
External anatomy of a typical bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, 5 Mantle, 6 Lesser coverts, 7 Scapulars, 8 Coverts, 9 Tertials, 10 Rump, 11 Primaries, 12 Vent, 13 Thigh, 14 Tibio-tarsal articulation, 15 Tarsus, 16 Feet, 17 Tibia, 18 Belly, 19 Flanks, 20 Breast, 21 Throat, 22 Wattle, 23 Eyestripe Topography of a typical passerine.
Fletching showing index feather (a.k.a. cock feather – green) and hen feathers (pink) half-out (equipment) – A type of arrow insert placed inside an arrow shaft, but with a portion extending beyond the end of the shaft by more than a nominal amount. Most often chosen to allow standard-threaded heads to be used with small-diameter shafts.
Feather-tailed possums (family Acrobatidae). This family of marsupials contains two genera, each with one species. The feathertail glider (Acrobates pygmaeus), found in Australia is the size of a very small mouse and is the smallest mammalian glider. The feathertail possum (Distoechurus pennatus) is found in New Guinea, but does not glide. Both ...
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The tail feathers are used to control flight acting as rudder and brake, only some of these feathers are as firmly attached as the bird's primaries. Contour feathers are arranged on the body of the bird in the manner of roof tiles. The tips of these feathers are waterproof and help protect the bird from the elements, while the inner parts of ...
Lesser flamingos flying in formation. When in gliding flight, the upward aerodynamic force is equal to the weight.In gliding flight, no propulsion is used; the energy to counteract the energy loss due to aerodynamic drag is either taken from the potential energy of the bird, resulting in a descending flight, or is replaced by rising air currents ("thermals"), referred to as soaring flight.
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