An organ-pipe mud dauber builds a row of clay tubes

A blue-black mud dauber adding a small clay pellet to a row of long mud tubes

An organ-pipe mud dauber builds a row of clay tubes

The female carries wet mud one small mouthful at a time and shapes it into long hollow tubes. Side by side, the finished tubes resemble the pipes of a tiny organ.

No music comes out, but the wall still got an organ.

Source · Smithsonian Science Education Center ↗

An organ-pipe mud dauber builds a row of clay tubes — ChillScroll

An organ-pipe mud dauber builds a row of clay tubes