We trapped a momma with 5 tiny kits on her back a few years ago. I know the litter can have up to 8 during a good year. With the drought, I wonder about the litter size.
Since you are catching them so quickly, do they appear to be young?
Possums only have even numbers of kits in a litter so she must have lost one. Also all the babies in one litter are all the same gender. - Very strange and kind of unevolved critters they are!
[SIZE=12pt]You're thinking of armadillos. They are the ones always having 4 same sex babies.[/SIZE]
[SIZE=12pt]I used to sell baby possums to a exotic pet dealer and have taken both sexes from the mommas pouch.[/SIZE]
Can't imagine wanting a possum for a pet....