Consider this segment of a food web: snails and grasshoppers eat pepper plants; spiders eat grasshoppers; shrews eat snails and spiders; owls eat shrews. the shrew occupies the trophic level(s of

When the shrews eat the snails and spiders, the shrews are considered to be secondary consumers. When the owl eats the shrews, it is considered to be the tertiary consumers. So meaning to say, the shrew occupied the trophic levels of secondary and tertiary consumers. 

Abay where the river empties into the sea