One of the marks to look for on a gatekeeper is the eye spot in the top corner of the underwing. It is black, dotted with two small white dots.
Old RopeThe Figure of Three, named for its shape in plan view, is a double lock on the Calder and Hebble Navigation between Horbury Bridge and Dewsbury. This section was opened in 1838. I notice rope marks which must go back a century or more on the edging stones in the central basin. From their position I'm sure they were cut by tow ropes in the days of horse-drawn barges. There are six or seven grooves, concentrated within a few yards a short distance down from the lock gates, just the position that they'd be in if a horse was pulling a barge out of the lock on its way downstream.
You can see striations running parallel to the grooves. I don't imagine that even tough hemp rope would be capable of cutting through solid sandstone, but if the ropes had picked up grains of sand - quartz grains - they'd be quite capable of cutting down through the rock over the years. The deepest of the grooves has been filled with cement.
Bumble Bee NestsThe vegetation on the bank of the towpath downstream from the lock has just been trimmed. In three places, each 50 or 100 yards apart, a dozen or so Bumble Bees are franticly hovering about. I guess that the regular flight path to their nests has been blocked by the trimmed debris.