instead, they eat other organisms -- microscopic animals, aquatic insects, crayfish and frogs -- that either eat plants themselves or live on or around them.
(they; eat; other organisms -- microscopic animals, aquatic insects, crayfish and frogs -- that either eat plants themselves or live on or around them) (either; eat; plants; themselves) (either; live; L:on or around them)
they either either
eat eat live
other organisms -- microscopic animals, aquatic insects, crayfish and frogs -- that either eat plants themselves or live on or around them
plants themselves
L:on or around them