After a few days of warm temps and rain, the ice on my ponds was down to a very unsafe-looking thin layer, melted at the edges, yesterday. In the new pond (with the most Gams and the fewest predators), Gams were cavorting at the surface next to the ice. I saw 2 of them swim in 1/4" of water over the ice for a while.

"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
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