Charizard’s design is based on a Dragon.
Cyndaquil is a “Fire Mouse Pokemon”. Rats and Mice are in the same genetic subfamily.
Torchic is a “Chick Pokemon”.
Chimchar is a “Chimp Pokemon.” Chimps and Monkeys are both simians, and Chimchar’s evolutionary line physically resembles Monkeys rather than Apes.
Tepig is a “Fire Pig Pokemon”.
Fennekin’s design is based on a Fennec fox, which is in the same genetic family as dogs.