How many species of fossil horse tooth can you spot?

Answer: Even scientists have trouble agreeing! Differences in tooth ridges might mean different species, but all of these horses are extinct, so there's no way to be sure.

How many longhorn beetle species can you spot?

Answer: Five--each belongs to a separate species. Beetles use antenna size and shape to find their mates!

How many species of Florida tree snails can you spot?

Answer: All of these shells belong to just one species, Linguus fasciatus. Tree snails find mates by smell, and by matching close-fitting sexual organs.