Nyctimantis rugiceps
The male frog finds a hole in a tree trunk with a pool of water in it 10 to 40 cm deep.  The holes are sometimes as close to the ground as 2 meters, but there are more of them more than 10 meters above the ground.  If something frightens the male frog, it will hide in the water.  The female frog comes to the tree trunk and lays her eggs in the water.  The male frog sings all year, and he may stay near the same place for a long time.