It might have occurred to us to share this exciting bit of news when we met him, but by the time we got there, nature study wasn’t uppermost in our minds. More pressing was that when we switched from electric to diesel, the throttle lever gave no acceleration beyond tickover. We made slow progress, trying to decide between gentle charging on tickover or faster travel but further depletion of the batteries. We managed to get moored before dark, but were still travelling at sunset. A heron was still out and about too.