WBiological interaction
WCamouflage
WCarnivore
WCompetition (biology)
WCompetitive exclusion principle
WCrypsis
WEpibiont
WFecundity selection
WHolozoic nutrition
WHost (biology)
WInterspecific competition
WIntraguild predation
WIntraspecific competition
WIsotricha
WMutualism (biology)
WMutualism Parasitism Continuum
WNatural selection
WNocturnality
WParadox of the plankton
WPHI-base
WPopularity
WScramble competition
WTerritory (animal)