This Northern Fantail mother (Rhipidura rufiventris) looks a little puzzled by the sumo baby in her gorgeous paperbark nest. And well she might. My birdo mate Bob Gosford agrees that she seems to be a victim of a nest invader who has left her to raise its egg. That baby is just too big! The beak is already as big as the fantail’s. Likely culprits could be Little Bronze Cuckoo (Chalcites minutillus) or the Brush Cuckoo (Cacomantis variolosus).