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The Tree of Life

Every animal comes from somewhere. This is the family tree of the whole animal kingdom as it lives on this site: one trunk, seven great branches, and 12,687 species out at the tips. Thicker branches hold more species. Tap any branch to climb it.

Animal KingdomReptiles12,650 speciesBirds7 speciesAmphibians6 speciesMammals6 speciesFishes7 speciesInsects and Invertebrates6 speciesPrehistoric Life5 species

Climb the branches

Open a class to see its orders, open an order to see its groups and families. Every name is a link to that branch of the encyclopedia.

  1. ClassReptilesReptilia12,650 species
    1. OrderCrocodiliansCrocodylia27 species
      1. FamilyAlligatoridae8 speciessee all 4 genera
      2. FamilyCrocodylidae18 speciessee all 4 genera
      3. FamilyGavialidae1 speciessee all 1 genus
    2. OrderTuataraRhynchocephalia1 species
      1. FamilySphenodontidae1 speciessee all 1 genus
    3. OrderScaled ReptilesSquamata12,252 species
      1. GroupLizardsSauria8,003 species
        1. FamilyAgamidae616 speciessee all 64 genera
        2. FamilyAlopoglossidae32 speciessee all 1 genus
        3. FamilyAmphisbaenidae185 speciessee all 12 genera
        4. FamilyAnguidae90 speciessee all 11 genera
        5. FamilyAnolidae428 speciessee all 1 genus
        6. FamilyBipedidae3 speciessee all 1 genus
        7. FamilyBlanidae7 speciessee all 1 genus
        8. FamilyCadeidae2 speciessee all 1 genus
        9. FamilyCarphodactylidae34 speciessee all 7 genera
        10. FamilyChamaeleonidae240 speciessee all 12 genera
        11. FamilyCordylidae70 speciessee all 10 genera
        12. FamilyCorytophanidae11 speciessee all 3 genera
        13. FamilyCrotaphytidae12 speciessee all 2 genera
        14. FamilyDibamidae31 speciessee all 2 genera
        15. FamilyDiplodactylidae202 speciessee all 25 genera
        16. FamilyDiploglossidae90 speciessee all 12 genera
        17. FamilyEublepharidae47 speciessee all 6 genera
        18. FamilyGekkonidae1,750 speciessee all 60 genera
        19. FamilyGerrhosauridae39 speciessee all 7 genera
        20. FamilyGymnophthalmidae302 speciessee all 56 genera
        21. FamilyHelodermatidae5 speciessee all 1 genus
        22. FamilyHoplocercidae22 speciessee all 2 genera
        23. FamilyIguanidae45 speciessee all 9 genera
        24. FamilyLacertidae391 speciessee all 43 genera
        25. FamilyLanthanotidae1 speciessee all 1 genus
        26. FamilyLeiocephalidae30 speciessee all 1 genus
        27. FamilyLeiosauridae38 speciessee all 5 genera
        28. FamilyLiolaemidae343 speciessee all 3 genera
        29. FamilyOpluridae8 speciessee all 2 genera
        30. FamilyPhrynosomatidae170 speciessee all 9 genera
        31. FamilyPhyllodactylidae169 speciessee all 10 genera
        32. FamilyPolychrotidae8 speciessee all 1 genus
        33. FamilyPygopodidae50 speciessee all 7 genera
        34. FamilyRhineuridae1 speciessee all 1 genus
        35. FamilyScincidae1,817 speciessee all 170 genera
        36. FamilyShinisauridae1 speciessee all 1 genus
        37. FamilySphaerodactylidae239 speciessee all 12 genera
        38. FamilyTeiidae173 speciessee all 18 genera
        39. FamilyTrogonophidae6 speciessee all 4 genera
        40. FamilyTropiduridae150 speciessee all 8 genera
        41. FamilyVaranidae93 speciessee all 1 genus
        42. FamilyXantusiidae38 speciessee all 3 genera
        43. FamilyXenosauridae14 speciessee all 1 genus
      2. GroupSnakesSerpentes4,249 species
        1. FamilyAcrochordidae3 speciessee all 1 genus
        2. FamilyAniliidae1 speciessee all 1 genus
        3. FamilyAnomalepididae23 speciessee all 4 genera
        4. FamilyAnomochilidae3 speciessee all 1 genus
        5. FamilyAtractaspididae68 speciessee all 10 genera
        6. FamilyBoidae67 speciessee all 14 genera
        7. FamilyBolyeriidae2 speciessee all 2 genera
        8. FamilyColubridae2,203 speciessee all 262 genera
        9. FamilyCyclocoridae8 speciessee all 5 genera
        10. FamilyCylindrophiidae15 speciessee all 1 genus
        11. FamilyElapidae412 speciessee all 56 genera
        12. FamilyElapoidea4 speciessee all 1 genus
        13. FamilyGerrhopilidae29 speciessee all 2 genera
        14. FamilyHomalopsidae61 speciessee all 29 genera
        15. FamilyLamprophiidae94 speciessee all 19 genera
        16. FamilyLeptotyphlopidae144 speciessee all 14 genera
        17. FamilyLoxocemidae1 speciessee all 1 genus
        18. FamilyMicrelapidae6 speciessee all 2 genera
        19. FamilyPareidae49 speciessee all 4 genera
        20. FamilyProsymnidae19 speciessee all 1 genus
        21. FamilyPsammodynastidae2 speciessee all 1 genus
        22. FamilyPsammophiidae57 speciessee all 8 genera
        23. FamilyPseudaspididae2 speciessee all 2 genera
        24. FamilyPseudoxyrhophiidae89 speciessee all 21 genera
        25. FamilyPythonidae38 speciessee all 11 genera
        26. FamilyTropidophiidae37 speciessee all 1 genus
        27. FamilyTyphlopidae282 speciessee all 19 genera
        28. FamilyUropeltidae74 speciessee all 7 genera
        29. FamilyViperidae412 speciessee all 37 genera
        30. FamilyXenodermidae38 speciessee all 6 genera
        31. FamilyXenopeltidae3 speciessee all 1 genus
        32. FamilyXenophidiidae2 speciessee all 1 genus
        33. FamilyXenotyphlopidae1 speciessee all 1 genus
    4. OrderTurtles and TortoisesTestudines370 species
      1. FamilyCarettochelyidae1 speciessee all 1 genus
      2. FamilyChelidae66 speciessee all 15 genera
      3. FamilyCheloniidae6 speciessee all 5 genera
      4. FamilyChelydridae5 speciessee all 2 genera
      5. FamilyDermatemydidae1 speciessee all 1 genus
      6. FamilyDermochelyidae1 speciessee all 1 genus
      7. FamilyEmydidae58 speciessee all 12 genera
      8. FamilyGeoemydidae75 speciessee all 19 genera
      9. FamilyKinosternidae35 speciessee all 4 genera
      10. FamilyPelomedusidae28 speciessee all 2 genera
      11. FamilyPlatysternidae3 speciessee all 1 genus
      12. FamilyPodocnemididae8 speciessee all 3 genera
      13. FamilyTestudinidae47 speciessee all 17 genera
      14. FamilyTrionychidae36 speciessee all 13 genera
  2. ClassBirdsAves7 species
    1. OrderApodiformes2 species
      1. FamilyApodidae1 speciessee all 1 genus
      2. FamilyTrochilidae1 speciessee all 1 genus
    2. OrderCharadriiformes1 species
      1. FamilyLaridae1 speciessee all 1 genus
    3. OrderFalconiformes1 species
      1. FamilyFalconidae1 speciessee all 1 genus
    4. OrderPasseriformes1 species
      1. FamilyCorvidae1 speciessee all 1 genus
    5. OrderSphenisciformes1 species
      1. FamilySpheniscidae1 speciessee all 1 genus
    6. OrderStruthioniformes1 species
      1. FamilyStruthionidae1 speciessee all 1 genus
  3. ClassAmphibiansAmphibia6 species
    1. OrderAnura4 species
      1. FamilyDendrobatidae1 speciessee all 1 genus
      2. FamilyPipidae1 speciessee all 1 genus
      3. FamilyRanidae1 speciessee all 1 genus
      4. FamilyRhinodermatidae1 speciessee all 1 genus
    2. OrderCaudata2 species
      1. FamilyAmbystomatidae1 speciessee all 1 genus
      2. FamilyCryptobranchidae1 speciessee all 1 genus
  4. ClassMammalsMammalia6 species
    1. OrderArtiodactyla3 species
      1. FamilyBalaenopteridae1 speciessee all 1 genus
      2. FamilyGiraffidae1 speciessee all 1 genus
      3. FamilyPhyseteridae1 speciessee all 1 genus
    2. OrderMonotremata1 species
      1. FamilyOrnithorhynchidae1 speciessee all 1 genus
    3. OrderProboscidea1 species
      1. FamilyElephantidae1 speciessee all 1 genus
    4. OrderRodentia1 species
      1. FamilyHeterocephalidae1 speciessee all 1 genus
  5. ClassFishesPisces7 species
    1. OrderAnguilliformes1 species
      1. FamilyAnguillidae1 speciessee all 1 genus
    2. OrderCoelacanthiformes1 species
      1. FamilyLatimeriidae1 speciessee all 1 genus
    3. OrderGobiiformes1 species
      1. FamilyOxudercidae1 speciessee all 1 genus
    4. OrderLamniformes1 species
      1. FamilyLamnidae1 speciessee all 1 genus
    5. OrderSalmoniformes1 species
      1. FamilySalmonidae1 speciessee all 1 genus
    6. OrderSyngnathiformes1 species
      1. FamilySyngnathidae1 speciessee all 1 genus
    7. OrderTetraodontiformes1 species
      1. FamilyMolidae1 speciessee all 1 genus
  6. ClassInsects and InvertebratesInvertebrata6 species
    1. OrderColeoptera2 species
      1. FamilyLampyridae1 speciessee all 1 genus
      2. FamilyScarabaeidae1 speciessee all 1 genus
    2. OrderHymenoptera1 species
      1. FamilyApidae1 speciessee all 1 genus
    3. OrderLepidoptera1 species
      1. FamilyNymphalidae1 speciessee all 1 genus
    4. OrderOctopoda1 species
      1. FamilyEnteroctopodidae1 speciessee all 1 genus
    5. OrderXiphosura1 species
      1. FamilyLimulidae1 speciessee all 1 genus
  7. ClassPrehistoric LifePrehistorica5 species
    1. OrderPterosauria1 species
      1. FamilyAzhdarchidae1 speciessee all 1 genus
    2. OrderSaurischia3 species
      1. FamilyArchaeopterygidae1 speciessee all 1 genus
      2. FamilyLognkosauria1 speciessee all 1 genus
      3. FamilyTyrannosauridae1 speciessee all 1 genus
    3. OrderSquamata (extinct marine)1 species
      1. FamilyMosasauridae1 speciessee all 1 genus