These are both from this week. The first (tall_grass.mp3) is in a marshy area near the bay, a high chattering sound coming from the tall grass near the bay in the early evening (around 6PM); I was unable to locate the bird (if indeed it was a bird). The second (screeching.mp3) is a loud screaming sound, possibly a raptor of some kind, in the middle of the afternoon (about 1PM), in the middle of a college campus, near a building, also not seen.
Any thoughts at all would be helpful! Thank you.