Insects, Arachnids and Molluscs
- Black Ant
- Black Ground Beetle
- Blue Damselfly
- Broad-bodied Hoverfly
- Brown Centipede
- Brown-lipped Snail
- Buff-tailed Bumblebee
- Bumblebee Hoverfly
- Carder Bee
- Common Cockchafer
- Common Darter
- Common Hawker
- Common Hoverfly
- Common Wasp
- Common Woodlouse
- Cranefly
- Earthworm
- Emerald Damselfly
- Flesh Fly
- Fourteen-spot Ladybird
- Fruit Fly
- Garden Bumblebee
- Garden Snail
- Garden Spider
- German Wasp
- Giant Wood Wasp
- Greenbottle Fly
- Green Shield Bug
- Harlequin Ladybird
- Harvestman
- Heineken Hoverfly
- Honey Bee
- House Spider
- Large Blackberry Aphid
- Lauxaniid Fly
- Lepthyphantes tenuis (Money Spider)
- Marmalade Hoverfly
- Marsh Hoverfly
- Migrant Hawker
- Mirid Bug
- Narcissus Hoverfly
- Nursery Web Spider
- Orange Ladybird
- Pellucid Hoverfly
- Red-headed Cardinal Beetle
- Red Soldier Beetle
- Red-tailed Bumblebee
- Scorpion Fly
- Seven-spot Ladybird
- Sinex Woodwasp
- Slug
- Soldier Fly
- Tapered Drone Fly
- White-footed Hoverfly
- White-tailed Bumblebee
- Wolf Spider
- Xyphosia Fruit Fly
- Yellow Slug
These creatures in italics have seen been in the Gainsborough area but not in Mercer Wood