- Brown Rat
- Common Pipistrelle
- Common Shrew
- Fox
- Grey Squirrel
- Hedgehog
- Mole
- Rabbit
- Roe Deer
- Soprano Pipistrelle
- Weasel
- Wood Mouse
These mammals in italics have been seen in the Gainsborough area but not in Mercer Wood
These mammals in italics have been seen in the Gainsborough area but not in Mercer Wood