How many letters does the top answer for “placental mammals having hooves with an odd number of toes on each foot” have?

The most common answer is perissodactyl (13 letters).

Crossword clue: placental mammals having hooves with an odd number of toes on each foot

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

perissodactyl 13 letters wn-def

placental mammals having hooves with an odd number of toes on each foot