This is a Cairns birdwing butterfly. I saw one yesterday, and another this morning, both in my host family's yard. They're quite large, maybe 8 or 10 centimetres.

I've also been seeing a lot of beautiful little olive-backed sunbirds, but I can't find a license-free photo of one to post. They always fly up to the window of my room, hover for a few seconds, and fly off. They're only a bit larger than hummingbirds, and they move just as fast. They have bright yellow stomachs with brownish-yellow backs and long, curved beaks. The males also have a bright, metallic blue patch under their throats.