Winds aloft were N. thermal activity was indicated by variable breezes. A huge migration of Anax junius was in progress. The air was full of small insects. Dragonfly flight behaviour was as above. At least 6 more were seen in my field of vision, some much higher.
None are visible to unaided vision.
Gulls were flapping. Binoculars were necessary to see the migration. Butterfly frequently made small half turns and other minor adjustments of its flight path - perhaps searching for stronger lift. An A. juinius was also seen.