Python in chook pen

Woken near midnight by dog barking. Minnie was staring at her kennel (pet carrier) on the verandah, behind it was a 1+ metre python (probably trying to get to swallows nest above there). I tied up dog and flicked python off verandah, gave it a few minutes to get clear and let dog off. She ran straight to the chook pen and barked more. Found the python now with a large lump (one of the three remaining 6 week old chicks) inside the chook tractor. Tricky operation - tractor is too low to climb in (with an angry snake), snake didn't want to move, chooks and dog in the way. Eventually shoved it out of pen - it makes escape through chainlink fence until the lump got stuck. After much poking left it there to work out for itself how to get free.