It's not just pampered handbag dogs and reluctant family pets getting in on the Halloween costume action - just take a look at this lot.
Bands of marauding ring-tailed lemurs and Patas monkeys at Woburn Safari Park in Milton Keynes have been getting their masks ready, promising a night of hairy terror come the 31st.
And beware the squirrel ghoul....genuinely terrifying.
Scroll down for more pictures
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Huffington Post UK | By Sara C Nelson Posted: 25/10/2012 15:36 BST Updated: 25/10/2012 15:43 BST