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Learn the wildlife of national parks

Learn the wildlife of Pre-Delta National Park

Entre Ríos · Argentina

574 species have research-grade observations inside Pre-Delta National Park on iNaturalist. KnowKi turns the most recorded into short lessons with real photos, so you know what you're looking at before you go.

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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. Bluish-gray Saltator Saltator coerulescens142
  2. Golden-billed Saltator Saltator aurantiirostris129
  3. Yellow-billed Cardinal Paroaria capitata80
  4. Crested Caracara Caracara plancus66
  5. Red-crested Cardinal Paroaria coronata56
  6. White-fronted Woodpecker Melanerpes cactorum55
  7. Greater Thornbird Phacellodomus ruber53
  8. Rufous-bellied Thrush Turdus rufiventris50
  9. Saffron Finch Sicalis flaveola46
  10. Great Antshrike Taraba major44

Plants

  1. Bluecrown passionflower Passiflora caerulea17
  2. Hibiscus striatus17
  3. Salvia pallida17
  4. Uruguayan Firecracker Plant Dicliptera squarrosa16
  5. Myrsine laetevirens12
  6. Aspilia silphioides12
  7. Clematis campestris12
  8. Jodina rhombifolia11
  9. Myrcianthes cisplatensis11
  10. Moonflower Ipomoea alba10

Mammals

  1. Capybara Hydrochoerus hydrochaeris22
  2. Coypu Myocastor coypus16
  3. Crab-eating Fox Cerdocyon thous8
  4. Chital Axis axis6
  5. Red Hocicudo Oxymycterus rufus6
  6. Brazilian Guinea Pig Cavia aperea3
  7. Lesser Grison Galictis cuja2
  8. Chacoan Gracile Opossum Cryptonanus chacoensis2

Insects

  1. Gulf Fritillary Dione vanillae32
  2. Claudina Crescent Tegosa claudina28
  3. Ithra Crescent Ortilia ithra20
  4. Little Dancer Metalmark Riodina lysippoides17
  5. Astylus quadrilineatus14
  6. White Peacock Anartia jatrophae13
  7. Tegosa orobia13
  8. Micrathyria longifasciata10
  9. Subtropical Lady Vanessa carye10
  10. Pin-tailed Pondhawk Erythemis plebeja9

Spiders and kin

  1. Aglaoctenus lagotis15
  2. Leucauge volupis7
  3. Asthenoctenus borellii4
  4. Polybetes pythagoricus4
  5. Long-bodied Cellar Spider Pholcus phalangioides2
  6. Southern House Spider Kukulcania hibernalis2
  7. Thaumasia velox2
  8. Chilean Tiger Spider Scytodes globula2
  9. Frigga quintensis2
  10. Trichonephila sexpunctata2

Reptiles

  1. Broad-snouted Caiman Caiman latirostris25
  2. Argentine Black-and-white Tegu Salvator merianae15
  3. Hilaire’s Side-necked Turtle Phrynops hilarii6
  4. Ocellated Whiptail Lizard Teius oculatus3
  5. Keeled Sepia Snake Dryophylax hypoconia2
  6. Lichtenstein's Green Racer Philodryas olfersii1
  7. False Water Cobra Hydrodynastes gigas1
  8. Silver-lined Worm Lizard Ophiodes intermedius1

Amphibians

  1. Bella Vista Toad Rhinella dorbignyi5
  2. Lesser Snouted Tree Frog Scinax nasicus3
  3. Cururu Toad Rhinella diptycha2
  4. Pale-legged Weeping Frog Physalaemus albonotatus1
  5. Mato Grosso Snouted Tree Frog Scinax acuminatus1
  6. Miranda's White-lipped Frog Leptodactylus macrosternum1

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. Parks outside the U.S. are from the World Database on Protected Areas (UNEP-WCMC and IUCN, Protected Planet). KnowKi is not affiliated with the National Park Service or any park's managers. Free, with no ads, no account, and no purchases.