What is another word for underfur?
Pronunciation: [ˌʌndəfˈɜː] (IPA) 
The term underfur refers to the fine, soft hair that grows beneath the longer, coarser guard hairs on many animals. This insulating layer helps to regulate body temperature and keep the animal warm in cold weather. Some synonyms for underfur include down, fluff, fuzz, and nap. Some specific examples of underfur include the soft downy feathers on a baby bird, the woolly undercoat of a sheep, or the velvety fur on a rabbit's ear. Regardless of the specific species or context, underfur is an essential adaptation for many animals living in cold climates.
