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The tuba is certainly the most intestinal of instruments, the very lower bowel of music.

Who needs such a long intestine, anyway?

The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the external surface of the body, but turned inwards and thus hidden in the organism.

The early bird may get the worm, but its the second mouse that gets the cheese.

The early bird gets the worm. The early worm... gets eaten.

Ever since then, all descendant vertebrates have had the forward end of the digestive system and the forward end of the respiratory system very much involved with each other. This manifests itself in the human body with a crossing of the two systems in the throat.

I feel like I just grabbed a big juicy worm with a right sharp hook in the middle of it.

A peculiar fact about termite-tapeworm-fungus-moss art is that it goes always forward, eating its own boundaries, and, likely as not, leaves nothing in its path other than the signs of eager, industrious, unkempt activity.

The early bird catches the worm.

As was to be expected, the discovery of the nervous apparatus of the salivary glands immediately impelled physiologists to seek a similar apparatus in other glands lying deeper in the digestive canal.