They are selectively bred from a mix of pot-bellied, New Zealand kune kune, Gloucester Old Spot and Tamworth pigs until they attain tiny proportions – fully grown, they stand at just over a foot.

它们是有选择地从大肚猪（pot-bellied）、新西兰困困猪（kune kune）、格洛斯特古老斑点猪（Gloucester Old Spot）以及汤沃斯猪（Tamworth）杂交而成，以获得娇小的身材——发育成熟后，它们站立时身高比一英尺多一点点。

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Now Norwich-based Hillside Animal Sanctuary wants Bertie to join its other famous escapees - including the Tamworth Two, pigs Butch and Sundance who went on the run in a wood near Tamworth in the English midlands.

BBC: Bertie the bull campaign hots up