When they emerge the snakes have breeding on their mind and you will see many mating balls where large numbers of the smaller males slither over a female (much larger) in an attempt to be the one who gets to mate. This is just a small mating ball!
Here you can see the males following the larger females as she slides away (she is the one with her head furthest to the right)
Even without a female present they don’t mind a little company it seems!
You can see the size differences well in this image
A couple of close-ups - the second shot shows the forked and bicoloured tongue.
There was other wildlife to see on the day of course – a few shots from the drive include this muskrat on the ice