how can anda tell the difference between snapping Turtles and normal Turtles?

A snapping penyu, kura-kura has lebih of a beak like mouth but a normal one is the oppisite

snappers have like pointy spikes on there back they sort of look like mountons and other turtles have smoother backs

Put your finger oleh it's mouth and if it bites anda and won't let go its a snapping turtle. Lol