Swallows Returning   Manoeuvre and zip make a trio of two swallows just returning from winterless New Guinea   and now fetching clay to plaster a cradle under verandah beams and nipping the odd spider—   swallows, now tremulous, now whipping over glass.     Green Catbird   Freckle-headed green catbird mews its territory out of mid rainforest.   Both sexes may bound up from branch to branch heading for the canopy   Catbird stays in the bush paired or single, ready to play the cripple   tapering off thereafter into fruit and leaf meals, telling their green storey.  …