Unlike most animals, which must travel in search of food, their food drifts to them, mainly tiny plants and animals called plankton suspended in the water.
(most animals; must travel; ) (their food; drifts; to them) (mainly tiny plants and animals called plankton; suspended; L:in the water)
most animals their food mainly tiny plants and animals called plankton
must travel drifts suspended
to them
L:in the water