Birds or Not

Howie and I had an experience last night
in his pen.
An opossum* was in his pen.
His bark turned to his "aggressive, serious
bark".
The opossum tried to escape, but was too
fat to fit through the lattice slats under the
screened in porch.
I wanted to laugh, but instead took Howie
for a walk to do his business.
Frank said I am the reason these critters
are here.  I feed the birds and the wildlife
come towards the droppings.
* opposum or possum?