Hair colour variation is partially correlated with skin and eye colour variation, reflecting differences in cellular interaction in different tissues2,3.
Striking coat colour variation in tuco-tucos (Rodentia: Ctenomyidae): a role for the melanocortin-1 receptor?
An identical pattern of shapes may express a different emotional mood through each colour variation.
Several studies have examined the genetic basis of hair colour variation.
But the bird in the video is an adult male "whiteface", a colour variation that originally popped up in Holland in 1969, and became the seventh colour variation that was established in captive cockatiels.
When individual colour variation is discontinuous within a species, that species is said to be polychromatic.
Geoff Oxford is a biologist at the University of York and an authority on both colour variation and speciation in spiders.
"Striking Coat Colour Variation in Tuco-Tucos (Rodentia: Ctenomyidae): a Role for the Melanocortin-1 Receptor?" Biological Journal of the Linnean Society 105 (3) (January 16): 665 680.
Aesthetical appearance has been affected as well both in terms of loss of lightness and colour variation.
The JPEG standard works by averaging colour variation and discarding what the human eye cannot see, a process known as "lossy" compression.
We have previously shown that colour variation is multimodal but continuously variable in natural populations, necessitating the use of quantitative methods to measure it (Davison et al. 2018).
