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Down feathers lack the interlocking barbules of pennaceous feathers, making them very soft and fluffy. The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds.
Newly hatched chicks have downy feathers that do not become waterproof until the chicks grow into juveniles. [20] The juvenile plumage, attained by thirty days after a chick hatches, is dark brown or gray above and white below. These feathers are mainly needed to protect the chicks from the strong sun rather than keep them warm.
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.
In more mixed eastern and southern habitats, the diversity of large predators is higher and the crowned eagle, despite its great power, is not assured at the top of the avian food chain. Amongst the more formidable raptors, the martial, the Verreaux's, and the crowned eagles, may live on the same hillside and all hunt hyraxes .
The tips of these feathers are waterproof and help protect the bird from the elements, while the inner parts of the feather near the bird's body are more downy. Wing contour feathers (known as coverts) help with the aerodynamics of the wing by covering where the flight feathers attach to the bone.
The study of feathers is called plumology (or plumage science). [6] [7] People use feathers in many ways that are practical, cultural, and religious. Feathers are both soft and excellent at trapping heat; thus, they are sometimes used in high-class bedding, especially pillows, blankets, and mattresses.
Topographic map of Spain. The wildlife of Spain includes the diverse flora and fauna of Spain.The country located at the south of France has two long coastlines, one on the north on the Cantabrian Sea, another on the East and South East on the Mediterranean Sea, and a smaller one on the west and south west on the Atlantic Ocean, its territory includes a big part of the Iberian Peninsula, the ...
The calamus is hollow and has pith formed from the dry remains of the feather pulp, and the calamus opens below by an inferior umbilicus and above by a superior umbilicus. [2] The stalk above the calamus is a solid rachis having an umbilical groove on its underside. Pennaceous feathers have a rachis with vanes or vaxillum spreading to either side.