Ring Ouzel
- Group
- Birds
- Peak month
- April
- Records since 2000
- 13,904
Species recorded in Essex
1,113 species
Essex — county
European green crab, Shore Crab
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 13,886
Common Nightingale
- Group
- Birds
- Peak month
- May
- Records since 2000
- 13,807
Primrose
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 13,713
Yellow Iris
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 13,607
Honeysuckle
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 13,575
Ground-elder
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 13,554
Annual Meadow-grass
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 13,548
Wood Sandpiper
- Group
- Birds
- Peak month
- August
- Records since 2000
- 13,506
Silver Y
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 13,462
White-lipped Snail
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 13,376
Bush Vetch
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 13,352
Polycentropus flavomaculatus
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 13,349
Hydropsyche pellucidula
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 13,302
Natterer's Bat
- Group
- Mammals
- Peak month
- February
- Records since 2000
- 13,257
Mouse-tail Moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,215
Common Pincushion
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,176
Silver Birch
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 13,123
Horned Grebe
- Group
- Birds
- Peak month
- January
- Records since 2000
- 13,082
Overleaf Pellia
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 13,066
Tufted Hairgrass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 13,053
European Turtle-Dove
- Group
- Birds
- Peak month
- May
- Records since 2000
- 13,049
Cryphaea heteromalla
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,047
Creeping Bent
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 13,035
Crescent-cup Liverwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 13,008
Square-spot Rustic
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 12,981
Soldier fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 12,979
Setaceous Hebrew Character
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 12,973
Common Striated Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 12,901
Red Dead-nettle
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 12,869
Pine Ladybird
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 12,843
Common Dog-violet
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 12,787
Dark Bush Cricket
- Group
- Grasshoppers and crickets
- Peak month
- August
- Records since 2000
- 12,688
Harbor seal
- Group
- Mammals
- Peak month
- July
- Records since 2000
- 12,641
Smooth Sow-thistle
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 12,637
Jack Snipe
- Group
- Birds
- Peak month
- October
- Records since 2000
- 12,579
Fern-leaved Hook-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 12,557
Common long-eared bat
- Group
- Mammals
- Peak month
- June
- Records since 2000
- 12,493
Oxeye Daisy
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 12,477
Caspian Gull
- Group
- Birds
- Peak month
- January
- Records since 2000
- 12,452
Noctule Bat
- Group
- Mammals
- Peak month
- July
- Records since 2000
- 12,276
Western waterweed, Nuttall's waterweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 12,267
Wild Angelica
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 12,214
Enchanter's nightshade, Witch's grass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 12,056
Silverweed
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 12,032
Common Chickweed
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 11,998
Greater Stitchwort
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 11,979
Garden Grass-veneer
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 11,898