One level back to Vertebrates (red blood, new mouths) 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) [Monotreme] (platypus, echidna) [Monotreme] (platypus, echidna) 2.3.3.3.1.2.3.3.1. [Monotreme] (platypus, echidna) [Marsupials] [Kangaroo, Koala] [Marsupials] [Kangaroo, Koala] 2.3.3.3.1.2.3.3.2. [Marsupials] [Kangaroo, Koala] [Umbilicals] (with placenta) [Umbilicals] (with placenta) 2.3.3.3.1.2.3.3.3. [Umbilicals] (with placenta) One level further to [Marine Mammals] (fins) One level further to [Land mammals] [Quadruped] One level further to [Primates] (with Hands) One level back to [Umbilicals] (with placenta) [Marine Mammals] (fins) 2.3.3.3.1.2.3.3.3.1. [Manatees] 2.3.3.3.1.2.3.3.3.1.1. [Seals] 2.3.3.3.1.2.3.3.3.1.2. [Whales] 2.3.3.3.1.2.3.3.3.1.3. One level further to [Manatees] One level further to [Seals] One level further to [Whales] One level back to [Umbilicals] (with placenta) [Land mammals] [Quadruped] 2.3.3.3.1.2.3.3.3.2. [Ungulates] 2.3.3.3.1.2.3.3.3.2.1. [Animals with Claws] 2.3.3.3.1.2.3.3.3.2.2. [Rodents] 2.3.3.3.1.2.3.3.3.2.3. One level further to [Ungulates](Hoofed animals) One level further to [Animals with Claws] One level further to [Rodents] One level back to [Umbilicals] (with placenta) [Primates] 2.3.3.3.1.2.3.3.3.3. [Apes] [Lemurs] 2.3.3.3.1.2.3.3.3.3.1. [Monkeys] [Baboons, Meerkats] 2.3.3.3.1.2.3.3.3.3.2. [Great Ape alike] 2.3.3.3.1.2.3.3.3.3.3. One level further to [Apes] [Lemurs] One level further to [Monkeys] [Baboons, Meerkats] One level further to [Great Ape alike]

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Mammals