KnowKi

Learn the wildlife of any country

Learn the wildlife of Denmark

Europe

11,544 species have research-grade observations in Denmark on iNaturalist. KnowKi turns the most recorded into short lessons with real photos, so you can learn a country's wildlife from home.

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Āki the kiwi, KnowKi's guide

Most recorded here

The species with the most research-grade observations on iNaturalist, and how many each has. Most recorded doesn't mean native.

Birds

  1. Mallard Anas platyrhynchos4,916
  2. Mute Swan Cygnus olor3,900
  3. Grey Heron Ardea cinerea3,794
  4. Common Wood-Pigeon Columba palumbus3,788
  5. Black-headed Gull Chroicocephalus ridibundus3,653
  6. Eurasian Blackbird Turdus merula3,638
  7. Greylag Goose Anser anser3,156
  8. Great Cormorant Phalacrocorax carbo3,083
  9. Eurasian Coot Fulica atra3,080
  10. Hooded Crow Corvus cornix2,981

Plants

  1. Lawn daisy Bellis perennis7,472
  2. Lesser celandine Ficaria verna5,815
  3. Great stinging nettle Urtica dioica5,526
  4. European beech Fagus sylvatica4,562
  5. Wood anemone Anemonoides nemorosa4,155
  6. Garlic mustard Alliaria petiolata4,149
  7. Common Tansy Tanacetum vulgare3,963
  8. Greater stitchwort Rabelera holostea3,843
  9. Sycamore maple Acer pseudoplatanus3,826
  10. Bird's-foot trefoil Lotus corniculatus3,481

Mammals

  1. Western Roe Deer Capreolus capreolus2,610
  2. Eurasian Red Squirrel Sciurus vulgaris2,117
  3. Brown Hare Lepus europaeus1,854
  4. Common Hedgehog Erinaceus europaeus1,439
  5. Red Fox Vulpes vulpes952
  6. Harbor Seal Phoca vitulina848
  7. European Mole Talpa europaea820
  8. European Fallow Deer Dama dama803
  9. Red Deer Cervus elaphus752

Insects

  1. Small Tortoiseshell Aglais urticae7,984
  2. Red Admiral Vanessa atalanta6,547
  3. European Peacock Butterfly Aglais io5,910
  4. Asian Lady Beetle Harmonia axyridis5,896
  5. Meadow Brown Maniola jurtina5,107
  6. Small Copper Lycaena phlaeas4,775
  7. Large Yellow Underwing Noctua pronuba4,672
  8. Seven-spotted Lady Beetle Coccinella septempunctata4,591
  9. Speckled Wood Pararge aegeria4,334
  10. Ringlet Aphantopus hyperantus4,086

Spiders and kin

  1. Cross Orbweaver Araneus diadematus5,746
  2. European Nursery Web spider Pisaura mirabilis2,945
  3. Giant House Spider Eratigena atrica2,350
  4. Wasp Spider Argiope bruennichi2,167
  5. Walnut Orbweaver Nuctenea umbratica1,532
  6. Four-spot Orbweaver Araneus quadratus1,278
  7. Long-bodied Cellar Spider Pholcus phalangioides1,261
  8. Canestrini's Harvestman Opilio canestrinii1,227
  9. Zebra Jumping Spider Salticus scenicus1,171
  10. Fencepost jumping spider Marpissa muscosa1,021

Reptiles

  1. Common Slowworm Anguis fragilis2,396
  2. Viviparous Lizard Zootoca vivipara2,190
  3. Grass snake Natrix natrix2,045
  4. Adder Vipera berus1,687
  5. Sand Lizard Lacerta agilis1,366

Amphibians

  1. European Toad Bufo bufo6,854
  2. European Common Frog Rana temporaria4,597
  3. Smooth Newt Lissotriton vulgaris3,270
  4. Edible Frog Pelophylax esculentus1,766
  5. Great Crested Newt Triturus cristatus1,325
  6. Moor Frog Rana arvalis756

Mollusks

  1. Roman Snail Helix pomatia4,017
  2. Brown-lipped Snail Cepaea nemoralis3,412
  3. Leopard Slug Limax maximus1,775
  4. Garden Snail Cornu aspersum1,365
  5. Copse Snail Arianta arbustorum1,152
  6. White-lipped Snail Cepaea hortensis792
  7. Blue Mussel Mytilus edulis729

How a trip works

A trip has its own trail of lessons: meet six species, match them to new photos, then practice with four choices. Species you learn go into your Fieldbook, and starting a trip earns its Passport stamp. Your home place stays as it is.

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Species lists and counts from research-grade observations on iNaturalist, as of October 2026. Free, with no ads, no account and no purchases.