Don't expect wonderful cinemaphotography here. Just listen. Four seconds of crackling. The river is thawing, inch by inch. Ellie was perturbed and stood at attention for what had to be three or four minutes. I thought she even whined, so I shut off the camera to see.
The sound moved downriver and she turned to follow it. There were some weird pinging and sqeaking, too. Ellie would not walk on the ice. Unusual for her, but she seemed spooked.