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Like many precocial hatchlings, domestic chickens are already covered with a coat of downy feathers when they hatch. The word down comes from the Old Norse word dúnn, which had the same meaning as its modern equivalent. [1] The down feather is considered to be the most "straightforward" of all feather types. [2]
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.
Extremely precocial species are called "superprecocial". Examples are the megapode birds, which have full-flight feathers at hatching and which, in some species, can fly on the same day. [ 3 ] Enantiornithes [ 4 ] and pterosaurs [ citation needed ] were also capable of flight soon after hatching.
Amaranthus hypochondriacus is an ornamental plant commonly known as Prince-of-Wales feather [3] or prince's-feather. [4] [5] Originally endemic to Mexico, it is called quelite, bledo [6] and quintonil in Spanish. [7] [8] In Africa and El Salvador, like many other species in the family Amaranthaceae, it is valued as source of food. [9]
It has also been suggested that dodo was an onomatopoeic approximation of the bird's call, a two-note pigeon-like sound resembling "doo-doo". [33] The Latin name cucullatus ("hooded") was first used in 1635 by the Spanish Jesuit Juan Eusebio Nieremberg as Cygnus cucullatus, in reference to Carolus Clusius's 1605 depiction of a dodo.
A typical vaned feather features a main shaft called the quill with an upper section called the rachis. Fused to the rachis are a series of branches, or barbs ; the barbs in turn have barbules branching off them, and they in turn branch yet again with a series of growths called barbicels , some of which have minute hooks called hooklets for ...
A similar edible tunicate in the Mediterranean is Microcosmus sabatieri, also called a sea violet or sea fig. [11] There are concerns about the safety of eating P. chilensis, given its high concentration of vanadium, with up to 1.9 mg/kg found in dry blood plasma. [12] Vanadium is a heavy metal, considered toxic at any more than incidental ...
Melicoccus bijugatus is a fruit-bearing tree in the soapberry family Sapindaceae, native or naturalized across the New World tropics including South and Central America, and parts of the Caribbean.