Possum or Opossum?

Good morning,

This is a zoomed image of a possum in the next yard from us.  Our pups made sure to let us (and the entire neighborhood) know she was there early one morning. 

Since she's out in the daytime, she probably has a passel of babies so is looking for food.  After I got these shots she went through an opening in the fence on the right side, then disappeared into a wooded area to the left of the stone benches.  We've seen possums here often during the years.  They eat all kinds of things we don't want around including slugs and ticks so we politely leave them alone.

And, either Possum or Opossum is correct.

:),
Lois