Their role in nature can be illustrated by the huge number of insects they eat and by the number of animals that eat toads, frogs or their tadpoles.
(Their role in nature; can be illustrated; by the huge number of insects they eat and by the number of animals) (the huge number of insects; eat; they) (animals; eat; toads, frogs or their tadpoles)
Their role in nature the huge number of insects animals
can be illustrated eat eat
by the huge number of insects they eat and by the number of animals
they
toads, frogs or their tadpoles