I thought it must go somewhere during the day, maybe to look for food, then return to the flower pot at night.
But I was wrong. The toad dug a hole in the dirt and buried himself during the day and came out at night.
The toad must eat the insects that come near the pot and take in water from the moist soil. Digging into the dirt protects him from the heat of the day and with its camouflaged skin he's impossible to see.
One night I watched him wipe the dirt off his back with his feet, first one foot then the other.
It's like having a pet just outside the back door. I hope he stays for a while.