May 3, 2014 notes about our backyard Hermit Thrush

On Sat, May 3, I wrote this info down in my Field Notes notebook, but I don't think that I recorded it at JotHut.

At 10:47 a.m., I observed a Hermit Thrush foraging on our back lawn, near the middle oval flower bed, and it used the "shaky leg" foraging technique.

When a HETH forages on the lawn or leaf litter, it will sometimes vertically vibrate one leg that, I assume, is done to flush insects from the ground, so that the HETH can snatch the insects out of the air.

The leg vibration is barely noticeable, and it requires focused observation because it seems that most of the time, this shaky leg foraging technique is not used. Maybe it depends upon how much insect activity is already occurring.

And the bird vibrates only one leg. It will alternate legs though. It will vibrate a leg, move, pause, vibrate the other leg, move, pause, repeat, and snagging insects if successful at flushing them.

The first time that I observed this behavior in a HETH occurred probably around the middle part of the last decade while birdwatching at Magee Marsh. I saw one of the HETH's legs vibrating rapidly, and I thought that the bird's leg was injured. But then the bird moved along the ground, thrush-like, paused, and vibrated its other leg. That's when I realized it was a foraging technique. It was late in the spring migration for HETH that year, but I observed