I have been hearing lots of yellow-billed cuckoos lately. These large birds are hard to see but become more vocal in mid to late summer. Listen for a rhythmic coo coo coo or keow keow keow. It can be repeated up to a dozen or more times, and can vary in cadence. It may start off slow and pick up speed. It may even call at night.
If you are lucky enough to see one, you will notice a large, very slim bird moving sluggishly through the tree canopy often pausing to sit completely still. In flight the very long thin tail is noticeable.
They seem to like to call on more humid days, hence the nickname "rain crow".
|Yellow-billed cuckoo by Phil Fowler|