but rather, the windsock-like catchnets of the tube-making caddisfly larvae I mentioned last post. The silk nets billow in the current, causing them to change shape now and then.
The caddisfly larvae that weave these catchnets are commonly called trumpet-net caddisflies - referring to the trumpet-shaped nets with their tapering tubes and flared openings.
I'm impressed with the trumpet-net caddisflies. For one reason, the quantities of underwater silk that they spin. Another reason is how they weave these looped catchnets right in the current. Thirdly, I'm impressed how the caddisflies set up shop with their nets and utilize the food resources that are just passing by on the current.
Above - a photo of a caddisfly net that is hung in the gap between two river cobbles.
Below - a collection of caddisfly nets hanging on vegetation and rocks.
Anyway... the river flows on...