The list increases
- Red fox
- Grey seal
- Harbour seal
- Harbour porpoise
- Alpine ibex
- Alpine chamois
- Red deer
- Brown rat
- House mouse (only domestic in zoos when looking at designated exhibits)
- Alpine Marmot
- Eastern Grey Squirrel (invasive ones in England)
- Red kite
- Peregrine falcon
- Golden eagle
- Barn owl
- Long-eared owl
- Great cormorant
- Little egret
- Cattle egret
- Black ibis
- European hoopoo
- European goldfinch
- Eurasian oystercatcher
- Common redshank
- Ruff
- Pied avocet
- Northern lapwing
- Eurasian curlew
- European spoonbill
- European white stork
- Common shelduck
- Common eider
- Smew
- Mandarin duck
- Barnacle goose
- Brent goose
- Wood duck
- Mute swan
- Black swan (in non-native range so might be an escaped one)
- Ring-necked pheasant
- Common raven
- Monk parakeet
- Ring-necked parakeet
- Greek tortoise
- Pond slider (probably all three subspecies and hybrids between them, invasive ones in Belgium)
- European perch
- Pumpkinseed (Invasive ones in Belgium)
- Common carp
- European eel
- Common chub
- Three-spined stickleback
- Ten-spined stickleback
- Common roach
- European shore crab
- Common prawn
- Moon jellyfish (A. aurita)
- Warty comb jelly
- Red fox
- Grey seal
- Harbour seal
- Harbour porpoise
- Alpine ibex
- Alpine chamois
- Red deer
- Brown rat
- House mouse (only domestic in zoos when looking at designated exhibits)
- Alpine Marmot
- Eastern Grey Squirrel (invasive ones in England)
- Red kite
- Peregrine falcon
- Golden eagle
- Barn owl
- Long-eared owl
- Great cormorant
- Little egret
- Cattle egret
- Black ibis
- European hoopoo
- European goldfinch
- Eurasian oystercatcher
- Common redshank
- Ruff
- Pied avocet
- Northern lapwing
- Eurasian curlew
- European spoonbill
- European white stork
- Common shelduck
- Common eider
- Smew
- Mandarin duck
- Barnacle goose
- Brent goose
- Wood duck
- Mute swan
- Black swan (in non-native range so might be an escaped one)
- Ring-necked pheasant
- Common raven
- Monk parakeet
- Ring-necked parakeet
- Greek tortoise
- Pond slider (probably all three subspecies and hybrids between them, invasive ones in Belgium)
- European perch
- Pumpkinseed (Invasive ones in Belgium)
- Common carp
- European eel
- Common chub
- Three-spined stickleback
- Ten-spined stickleback
- Common roach
- European shore crab
- Common prawn
- Moon jellyfish (A. aurita)
- Warty comb jelly