KnowKi

Learn the wildlife of marine protected areas

Learn the wildlife of the Wadden Sea

Netherlands · Germany · Denmark

3,059 species have research-grade observations in the Wadden Sea on iNaturalist. KnowKi turns the most recorded into short lessons with real photos, from fish and seabirds to the life along the shore.

The Wadden Sea World Heritage Site.

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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. Eurasian Oystercatcher Haematopus ostralegus1,313
  2. Black-headed Gull Chroicocephalus ridibundus962
  3. Common Redshank Tringa totanus820
  4. Eurasian Curlew Numenius arquata775
  5. European Herring Gull Larus argentatus770
  6. Common Eider Somateria mollissima754
  7. Common Shelduck Tadorna tadorna683
  8. Ruddy Turnstone Arenaria interpres554
  9. Brant Branta bernicla535
  10. Eurasian Spoonbill Platalea leucorodia465

Plants

  1. European Searocket Cakile maritima367
  2. Common Sea-lavender Limonium vulgare285
  3. Sea Thrift Armeria maritima242
  4. Sea Milkwort Lysimachia maritima231
  5. Rugosa rose Rosa rugosa230
  6. Sea Sandwort Honckenya peploides217
  7. Sea-buckthorn Hippophae rhamnoides210
  8. Sea Aster Tripolium pannonicum198
  9. Sea Wormwood Artemisia maritima183
  10. Common Glasswort Salicornia europaea182

Mammals

  1. Harbor Seal Phoca vitulina850
  2. Grey Seal Halichoerus grypus268
  3. Brown Hare Lepus europaeus184
  4. Western Roe Deer Capreolus capreolus136
  5. European Rabbit Oryctolagus cuniculus81
  6. Harbour Porpoise Phocoena phocoena64
  7. European Fallow Deer Dama dama20
  8. Red Fox Vulpes vulpes19

Insects

  1. Small Copper Lycaena phlaeas126
  2. Red Admiral Vanessa atalanta105
  3. Painted Lady Vanessa cardui99
  4. Seven-spotted Lady Beetle Coccinella septempunctata90
  5. Grayling Hipparchia semele84
  6. Fox Moth Macrothylacia rubi84
  7. Small Heath Coenonympha pamphilus78
  8. Common Blue Polyommatus icarus76
  9. Cinnabar moth Tyria jacobaeae75
  10. Common Drone Fly Eristalis tenax71

Spiders and kin

  1. Cross Orbweaver Araneus diadematus46
  2. Sand Bear Spider Arctosa perita28
  3. Wasp Spider Argiope bruennichi21
  4. Canestrini's Harvestman Opilio canestrinii20
  5. Four-spot Orbweaver Araneus quadratus19

Amphibians

  1. Natterjack Toad Epidalea calamita90
  2. European Toad Bufo bufo77
  3. European Common Frog Rana temporaria66
  4. Smooth Newt Lissotriton vulgaris30

Mollusks

  1. Common Cockle Cerastoderma edule467
  2. Soft-shelled Clam Mya arenaria309
  3. Pacific Oyster Magallana gigas290
  4. Common Whelk Buccinum undatum283
  5. Baltic Macoma Macoma balthica256
  6. Common Periwinkle Littorina littorea244
  7. European Common Cuttlefish Sepia officinalis215
  8. Blue Mussel Mytilus edulis199
  9. Rayed Trough Shell Mactra stultorum143
  10. European Flat Oyster Ostrea edulis141

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. KnowKi is not affiliated with NOAA or any area's managers. Free, with no ads, no account and no purchases.