In what is a poorly studied group at Chew, 32 species of mammal have been recorded at the lake. List compiled by Wessex Ecological Consultancy. Erinaceus europaeus Hedgehog Presumably common Talpa europaeus Mole Mole hills common in grasslands and woodlands Sorex araneus Common Shrew Occasional - can be prominent along the track between Moreton and Stratford Sorex minutus Pygmy Shrew Status uncertain - one found under timber, but probably more common Neomys fodiens Water Shrew Status uncertain - one seen in Nunnery Hide Myotis brandti Brandt's Bat Rare foraging records, one once seen roosting in Moreton hide Myotis nattereri Natterer's Bat Foraging records Myotis daubentoni Daubenton's Bat Surprisingly rare, sometimes over Herriott’s Pool Nyctalus noctula Noctule Bat Rare foraging records Nyctalus leisleri Leisler's Bat Rare foraging records Pipistrellus pipistrellus Common Pipistrelle Fairly common Pipistrellus pygmaeus Soprano Pipistrelle Fairly common Pipistrellus nathusii Nathusius' Pipistrelle The first known British breeding colony was at Chew Plecotus auritus Brown Long-eared Bat Sometimes seen hunting around woods in the evening Oryctolagus cuniculus Rabbit Common Lepus europaeus Brown Hare Only seen very rarely, usually on the west side Sciurus carolinensis Grey Squirrel Common Clethrionomys glareolus Bank Vole Much less frequent than the next species Microtus agrestis Field Vole Common in grasslands, numbers fluctuate Apodemus sylvaticus Wood Mouse Common Micromys minutus Harvest Mouse Significant colonies at southern end of lake, though seldom recorded recently Mus domesticus House Mouse Rare around buildings Rattus norvegicus Common Rat Common - the causeway at Herriott's Bridge is stiff with them in summer! Vulpes vulpes Red Fox Common (especially in autumn) - a record of 15 seen at once in August 2005! Mustela putorius Polecat A few records recently of apparent Polecats, including one with young in 2007 Mustela erminea Stoat Rarely seen, but present Mustela nivalis Weasel Seen more often than last the previous species Mustela vison Mink Was common, now much less so (very few recent sightings, but one in 2005) Meles meles Badger Several setts Lutra lutra Otter Became extinct, now re-established at low density, though hardly ever seen Capreolus capreolus Roe Deer Common and regularly seen, increasing Muntiacus reevesi Muntjac One record Phocoena phocoena Harbour Porpoise One, after storms