Little one

As many as 70% of all the animals in some forests rely on what as their main food source? solve the crossword, then read down the yellow squares to spell out the prize answer.

ACROSS

1 Passing craze (3) 3 Edge of a glass (3) 5 Furious (5) 7 Hang heavy (3) 8 Poisonous snake (3)

DOWN

1 Evergreen tree (3) 2 Collect large amounts (5) 3 Chest bone (3) 4 Coat hook (3) 6 Kind of dance (3)