How many letters does the top answer for “which of these animals are not real” have?

The most common answer is lion (4 letters).

Crossword clue: which of these animals are not real

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

lion 4 letters otdb

large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male

nemean 6 letters otdb

Of or pertaining to Nemea, in Argolis, where the ancient Greeks celebrated games, and Hercules killed a lion.

which of these animals is not a lizard 60% similar → tuatara