Emerald Damselfly
- Group
- Dragonflies and damselflies
- Peak month
- August
- Records since 2000
- 46,053
Species recorded in Essex
1,113 species
Essex — county
Whooper Swan
- Group
- Birds
- Peak month
- October
- Records since 2000
- 45,803
Ruddy Darter
- Group
- Dragonflies and damselflies
- Peak month
- August
- Records since 2000
- 45,389
Hawthorn
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 44,514
Northern River Crangonyctid
- Group
- Crustaceans
- Peak month
- October
- Records since 2000
- 44,412
Common Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 44,396
New Zealand Mudsnail
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 44,337
Spotted Flycatcher
- Group
- Birds
- Peak month
- May
- Records since 2000
- 43,874
Wall
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 43,859
Cypress-leaved Plait-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 41,845
Rough-stalked Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 41,342
Red-eyed Damselfly
- Group
- Dragonflies and damselflies
- Peak month
- June
- Records since 2000
- 40,953
White-tailed Bumble Bee
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 40,355
(Great or Northern) Crested Newt
- Group
- Amphibians
- Peak month
- May
- Records since 2000
- 39,193
Ribwort Plantain
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 39,026
Hogweed
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 38,903
Early Bumble Bee
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 38,075
Eurasian Spoonbill
- Group
- Birds
- Peak month
- August
- Records since 2000
- 37,657
Green Alkanet
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 37,435
Springy Turf-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 37,320
Green Shieldbug
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 37,202
Brambling
- Group
- Birds
- Peak month
- October
- Records since 2000
- 36,793
Tree Bumblebee
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 35,931
Common Redstart
- Group
- Birds
- Peak month
- May
- Records since 2000
- 35,860
Creeping Buttercup
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 35,825
Creeping Thistle
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 35,350
Garlic Mustard
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 35,141
Cleavers
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 35,139
Ash
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 35,025
Tapered Drone Fly
- Group
- True flies
- Peak month
- April
- Records since 2000
- 35,005
Sycamore [tree]
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 34,632
Gray Partridge
- Group
- Birds
- Peak month
- May
- Records since 2000
- 34,405
Dangling Swamp-lover
- Group
- True flies
- Peak month
- September
- Records since 2000
- 34,301
Arctic Tern
- Group
- Birds
- Peak month
- May
- Records since 2000
- 33,992
Bearded Reedling
- Group
- Birds
- Peak month
- May
- Records since 2000
- 33,456
Common frog
- Group
- Amphibians
- Peak month
- March
- Records since 2000
- 33,381
Firecrest
- Group
- Birds
- Peak month
- October
- Records since 2000
- 33,295
Hazel
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 33,120
Holly
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 32,893
Bee Fly
- Group
- True flies
- Peak month
- April
- Records since 2000
- 32,811
Common Loon
- Group
- Birds
- Peak month
- January
- Records since 2000
- 32,765
Corn bunting
- Group
- Birds
- Peak month
- May
- Records since 2000
- 32,362
Pointed Spear-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 32,268
Large Yellow Underwing
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 31,787
White Clover
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 31,709
Capillary Thread-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 31,536
Yellow-legged Gull
- Group
- Birds
- Peak month
- August
- Records since 2000
- 31,327
Essex Skipper
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 31,187