Little Tern
- Group
- Birds
- Peak month
- May
- Records since 2000
- 20,325
Species recorded in Essex
1,113 species
Essex — county
Common Tamarisk-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 20,226
Long-tailed Duck
- Group
- Birds
- Peak month
- January
- Records since 2000
- 20,221
Common Pocket-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 19,854
Bird's-claw Beard-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 19,787
Soft Rush
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 19,779
Silky Wall Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 19,515
Greater Scaup
- Group
- Birds
- Peak month
- January
- Records since 2000
- 19,363
Field Maple
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 19,098
Purple Hairstreak
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 18,902
Common Mussel
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 18,892
Purple Sandpiper
- Group
- Birds
- Peak month
- January
- Records since 2000
- 18,878
European Pied Flycatcher
- Group
- Birds
- Peak month
- May
- Records since 2000
- 18,794
Dog's Mercury
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 18,728
Cinnamon Sedge
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 18,706
Brown Lipped Snail
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 18,559
Common Mouse-ear
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 18,442
Brimstone Moth
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 18,372
Silver-moss
- Group
- Mosses
- Peak month
- November
- Records since 2000
- 18,165
Bank Haircap
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 18,136
White-tipped Bristle-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 18,107
European Eel
- Group
- Fish
- Peak month
- July
- Records since 2000
- 18,003
Gemmabryum dichotomum
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 17,871
Clustered Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 17,847
Foxglove
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 17,704
Common Glow-worm
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 17,587
Heart and Dart
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 17,584
Bluebell
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 17,510
Hedge Woundwort
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 17,492
Lords-and-Ladies [Arum maculatum]
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 17,452
Heath Star Moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 17,406
White Dead-nettle
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 17,320
Willow Beauty
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 17,291
Fireweed
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 17,268
Cherry Laurel
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 17,196
Cylindric Beard-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 17,033
Groundsel
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 16,933
Red Fescue
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,907
Silky Forklet-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 16,885
Alder
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 16,859
Meadow Grasshopper
- Group
- Grasshoppers and crickets
- Peak month
- July
- Records since 2000
- 16,828
Curlew Sandpiper
- Group
- Birds
- Peak month
- September
- Records since 2000
- 16,711
False Oat-grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,693
Ramsons
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 16,569
Ten-spot Ladybird
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 16,478
Nipplewort
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,456
Dark Arches
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 16,454
Common Orange Lichen
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 16,366