You will likely have rats and/or mice who love all the grain that becomes scattered about.
We tend to only set out traps at night so the birds that come in during the day do not get caught in the traps.
Lately we have noticed something rather strange. We have found the traps sprung with a rather large dead rat nearby.
Could it be the rats get out of the trap after springing it but die from their injuries?
I am really not wanting to do a rat autopsy to find cause of death.
We do not use poison since owls in the area might eat a poisoned rodent and become ill or die. Also other animals may eat the bait.
jtk