They're 'elegant little killers' but what's a weasel's favourite food?

Irish Stoat (Mustela erminea Hibernica). What people call ‘weasels’ in Ireland are, in fact, ‘stoats’. We have no weasels here, although they are native to Britain. Much smaller than stoats, male weasels weigh up to 130 grams, whereas a stoat might reach 500 grams. Picture: Carl Morrow / Irish Stoat Survey