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underfur

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
un·der·fur  (ndr-fûr)
n.
The soft, fine undercoat of certain mammals, such as otters, beavers, and seals.

underfur [ˈʌndəˌfɜː]
n
(Life Sciences & Allied Applications / Zoology) the layer of dense soft fur occurring beneath the outer coarser fur in certain mammals, such as the otter and seal Also called undercoat
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.underfur - thick soft fur lying beneath the longer and coarser guard hairunderfur - thick soft fur lying beneath the longer and coarser guard hair
fur - dense coat of fine silky hairs on mammals (e.g., cat or seal or weasel)


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They have a very soft underfur which is protected by their outer layer of longer hair which then traps a layer of air to keep them warm and dry underwater.
A thick layer of blubber beneath the skin gives added insulation, while coarse fur and dense underfur provide waterproofing via a chemical secreted in the skin glands.
The well-preserved remains of Castorocauda show that its body was covered with a thick underfur and an outer coat of longer, stiffer guard hairs--the earliest fossilized fur found to date.
 
 
 
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