noun
(usually the food chain ) a series of living creatures in which each type of creature feeds on the one below it in the series :
Insects are fairly low down (on) the food chain.
noun
(usually the food chain ) a series of living creatures in which each type of creature feeds on the one below it in the series :
Insects are fairly low down (on) the food chain.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005