Swallows usually fly high overhead here. Only time they come down to the garden is some time in August when there is a some kind of hatching event -- it might be winged ants flying off at once. I can actually see them rising from the ground in swarms all over the yard. Then the swallows come down to skim across the garden..
It's a sight because the bigger dragon flies are making aerial sweeps too, and they somehow do not hit each other.
Learning never ends because we can share what we've learned. And in sharing our collective experiences, we gain deeper understanding of what we learned.