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Secret Of Scottish Sheep Evolution Discovered ScienceDaily (Jan. 20, 2008) — Researchers from the University of Sheffield, as part of an international team, have discovered the secret of why dark sheep on a remote Scottish Island are mysteriously declining, seemingly contradicting Darwin's evolutionary theory. Dr Jacob Gratten and Dr Jon Slate, from the University's Department of Animal and Plant Sciences, led the team, which found that the gene responsible for dark coat colour is linked to other genes that reduce an animal's fitness. The researchers looked at coat colour in a feral population of Soay sheep on Hirta in the...

PARIS (AFP) – Climate change has caused a flock of wild sheep on a remote northern Scottish island to become smaller, according to an unusual investigation published on Thursday. The study explains a mystery that has bedevilled scientists for the past two years. The wild Soay sheep live on Hirta, in the St. Kilda archipelago in the storm-battered Outer Hebrides, and have been closely studied for nearly a quarter of a century. The law of evolutionary theory says the brown, thick-coated ungulates should have got progressively bigger. Tough winters mean that bigger sheep have a better chance of survival and...

Enlarge ImageSlimming down. Sheep on the remote Scottish isle of Hirta have been getting smaller.Credit: A. Ozgul/Science Call it the case of the shrinking sheep. On the remote Scottish island of Hirta, sheep have been getting smaller, shrinking an average of 5% over the last 24 years. Don't blame evolution, though. Researchers say climate change is the real culprit. The Hirta sheep belong to a breed known as Soay, after the remote Scottish island where they arose. One of the most primitive forms of domestic sheep, Soays first came to Hirta in 1932. Because Hirta is a remote island,...

Strong immunity may play a key role in determining long life, but may do so at the expense of reduced fertility, a Princeton University study has concluded. An 11-year study of a population of wild sheep located on a remote island off the coast of Scotland that gauged the animals' susceptibility to infection may give new insight into why some people get sicker than others when exposed to the same illness. The answer to this medical puzzle may lie in deep-rooted differences in how animals survive and reproduce in the wild, according to the study, which was led by Princeton...