In biology the relationship of what eats what ... Remember, food chains do not show the number of organisms at each trophic level. Pyramids of number are not always perfect pyramids because ...

Trophic cascades are powerful indirect interactions ... Role of crab herbivory in die-off of New England salt marshes. Conservation Biology 23, 672-679 (2009). Jackson, J. B.

Integrating parasites into food webs also suggests that the classical Eltonian pyramid (Elton 1927) may need to be revised: if parasites feed at a trophic level above their hosts, parasites would ...