One level back to Genus and species (Zoology) 2.3.3.3.1.2.3. Vertebrates (red blood, new mouths) One level further to Fish (spawning) One level further to Egglayer (cloaca) One level further to Mammals Fish (spawning) Fish (spawning) 2.3.3.3.1.2.3.1. Fish (spawning) One level further to [Armored fishes] (extinct) One level further to [Bony Fish] One level further to [Cartilaginous Fish] [Sharks, Rays] One level back to Fish (spawning) 2.3.3.3.1.2.3.1.1. [Armored fishes] (extinct) One level back to Fish (spawning) 2.3.3.3.1.2.3.1.2. [Bony Fish] 2.3.3.3.1.2.3.1.2.1. [Flesh Fins] [Coelacanths, Lungfish] 2.3.3.3.1.2.3.1.2.2. [Rayfish] [Eel, codfish, herring...] One level further to [Flesh Fins] [Coelacanths, Lungfish] One level further to [Rayfish] [Eel, codfish, herring...] One level back to Fish (spawning) 2.3.3.3.1.2.3.1.3. [Cartilaginous Fish] [Sharks, Rays] Egglayer (cloaca) Egglayer (cloaca) 2.3.3.3.1.2.3.2. Egglayer (cloaca) One level further to Amphibians (frogs, amphibians...) One level further to Reptiles (crawlers) One level further to Birds One level back to Egglayer (cloaca) 2.3.3.3.1.2.3.2.1. Amphibians One level back to Egglayer (cloaca) 2.3.3.3.1.2.3.2.2. Reptiles 2.3.3.3.1.2.3.2.2.1. [Snakes] 2.3.3.3.1.2.3.2.2.2. [Lizards + Crocodiles] 2.3.3.3.1.2.3.2.2.3. [Turtles] One level further to [Snakes] One level further to [Lizards + Crocodiles] One level further to [Turtles] One level back to Egglayer (cloaca) 2.3.3.3.1.2.3.2.3. Birds 2.3.3.3.1.2.3.2.3.1. [Running Birds] [Ostrich, Coccyx Chicken] 2.3.3.3.1.2.3.2.3.2. [Chicken-and Anseriformes] 2.3.3.3.1.2.3.2.3.3. [New Birds] [Songbirds, Squawks] One level further to [Running Birds] [Ostrich, Coccyx Chicken] One level further to [Chicken-and Anseriformes] One level further to [New Birds] [Songbirds, Squawks] Mammals Mammals 2.3.3.3.1.2.3.3. Mammals One level further to [Monotreme] (platypus, echidna) One level further to [Marsupials] [Kangaroo, Koala] One level further to [Umbilicals] (with placenta) One level back to Mammals 2.3.3.3.1.2.3.3.1. [Monotreme] One level back to Mammals 2.3.3.3.1.2.3.3.2. [Marsupials] [Kangaroo, Koala] One level back to Mammals 2.3.3.3.1.2.3.3.3. [Umbilicals] 2.3.3.3.1.2.3.3.3.1. [Marine Mammals] (fins) 2.3.3.3.1.2.3.3.3.2. [Land mammals] [Quadruped] 2.3.3.3.1.2.3.3.3.3. [Primates] One level further to [Marine Mammals] (fins) One level further to [Land mammals] [Quadruped] One level further to [Primates] (with Hands)

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Vertebrates (red blood, new mouths)