Is it safe to put an oak tree trunk and a palm tree trunk in my girls' run? I could not find anything about tree trunks on the toxic plants/trees lists. I have four pet hens; I doubt they'll attempt to eat the trunks. I plan to use them as a stool for us humans to perch and a landing for the girls as they jump to a higher platform. Thoughts? I salvaged the trunks from hurricane debris piles after a recent storm and would like to put them to a happy use.