They are typically active from May until late September. They spend much of their time buried in the mud or sand at the bottom of streams, rivers or lakes. They can remain submerged for up to about 5 hours. They do not leave the water very often except to bathe in the sun or for the females to lay eggs. Even then they stay close to the water ready to dive in at the least sign of a predator. Female spiny softshells are much larger then their male counterparts, with females getting to a length of about 18" and males getting to about 9". This is demonstrated in the photo above.