Fulling Mill Ant Black CdC

The waist is the whole silhouette

An ant is one of the few insects a trout can identify from below without any doubt at all. Two dark lumps with a pinched waist between them is a shape nothing else on the water has, and that is why fish lock onto ants so completely once they start taking them. The CdC sits this one down in the film where a drowning ant actually rides, rather than perched on top of it.