Now that the garden is officially done for the season, I've moved some birds to the fenced in area to give them more space. My thought is they've got some weeding to do plus there's probably still some vegetation and bug/insect life they can enjoy. My question is: is their poop going to burn my garden for next year or might their poo be good for the garden since it's mixing with straw, soon to have tons of leaves and then snow to "incubate/compost" until next spring? Thanks!