I cut a couple of medium sized Black Walnut trees that were
growing on the edge of a small prairie patch beside the house. The trunks were about four inches in
diameter, so after stripping off the branches, I left them in the lawn beside
the barn to cut up for firewood. When I
returned from adding the branches to the brush pile, I found the logs being
used as a perch and hunting platform by a swarm of small Robber Flies.
Robber Flies come in all sizes, but it’s usually the large
species that get all of the notice.
Being extremely tiny doesn’t keep these guys from being quite attractive
and interesting. Sunlight on the
transparent wings produced a shifting pattern of pastel purple, blue and green.
These are predators that feed on other small insects. Each log had dozens of flies taking advantage
of the slight elevation above the lawn grasses to watch for passing prey items. When you’re that small it doesn’t take much
of a rise to put you well above the action.
Prey of the day appeared to be small leaf hoppers. The hoppers were so small that I couldn’t
even see them in the air. The Robber
Flies with their super sized eyes had no such trouble. Each quick trip out from the log resulted in
another capture.
A variety of leaf hopper species were being captured. Unfortunately, I couldn’t identify them with
any more accuracy than I could the Robber Flies.
I watched the Robber Fly action for quite a while. The flies would eat the select portion of the
leaf hoppers and then drop the remains before heading out for another capture. I didn’t want to disturb the action, so I
left the logs where they lay. I’ll
finish cutting them up some other day.
I love the tiny arenas of action you find on your property.
ReplyDeleteHi Pat. There's something going on everywhere I look.
ReplyDelete