SWARTHMORE's wriggly team?

Usage examples of earthworms.

But seeds often get covered by earth thrown up by burrowing quadrupeds or scratching birds, by the castings of earthworms, by heaps of excrement, the decaying branches of trees, etc.

But it must aid them materially when they happen to break obliquely into cracks, or into burrows made by earthworms or larvae.

The location should be sunny, level and open to the ground to permit earthworms and microorganisms to enter from below.