You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: On the inaccessible island of Soay are sheep of a unique type, which lived as feral animals and belonged to the owner of the islands, not to the islanders.  These Soay sheep are believed to be remnants of the earliest sheep kept in Europe in the Neolithic Era, and are small, short-tailed, usually brown with white bellies, and have naturally moulting fleeces.  About 200 Soay sheep remain on Soay itself, and soon after the evacuation a second feral population of them was established on Hirta, which at that time had no sheep; these now number between 600 and 1,700. A few Soays have been exported to form breeding populations in other parts of the world, where they are valued for their hardiness, small size and unusual appearance. On Hirta and Soay, the sheep prefer the Plantago pastures, which grow well in locations exposed to sea spray and include red fescue (Festuca rubra), sea plantain (Plantago maritima) and sea pink (Armeria maritima).The St Kildans kept up to 2,000 of a different type of sheep on the islands of Hirta and Boreray.  These were a Hebridean variety of the Scottish Dunface, a primitive sheep probably similar to those kept throughout Britain during the Iron Age.  At the time of the evacuation all the islanders' sheep were removed from Hirta, but those on Boreray were left to become feral, and these are now regarded as a breed in their own right, the Boreray.  The Boreray is one of the rarest British sheep, and is one of the few remaining descendants of the Dunface (although some Scottish Blackface blood was introduced in the nineteenth century).
Output:
What is the type of sheep that was left during evacuations by the people who had up to 2,000 different types of sheep?