Yesterday at about 5:45 p.m., as I returned from the pasture, I heard the Sandhill Crane, tuk-tuk–tuk-tuk, and looked south towards Hannibal, Texas, the direction I had seen flocks earlier this week. I saw no flocks to the south. Catching the sound again, I looked east towards the Rust Ranch (whose horse barn repeats my microwave for internet service) and saw a huge, migratory, single congregation of Sandhill Crane heading north, three miles away, 1,500 feet a.g.l. over the Rust Ranch barns.
By my quick and dirty count, I estimated the northing cranes at about 350-500 in number. My camera was back at the house, so I could not get there in time to snap a picture of this huge flock.
I may have this wrong, but I discerned that in this large flock of 350+, only, say, ten cranes calling, tuk-tuk. I would have thought more vocalizations from such a large group. But no. It was the largest flock I have seen in flight. I have heard large flocks on the ground in the Muleshoe, Texas, marshes and their murmurs are quite numerous before daylight. Beautiful, peaceful chorus.