Hawk eats Snakes and squirrels  in this food web.
 Explanation:
Data given on food web:
sun - producer
grasshopper consumer
grasshopper⇒ squirrel, wolf and snake
squirrel ⇒ wolf, snake, and bird. 
wolf died and decomposes
bird⇒ decomposes with mushrooms and worms
decomposition⇒ nutrients in soil
Hawks are the carnivores and bird. They can be either secondary or tertiary consume in a food web.
Hawk predated on Snakes and squirrels in this food web
The food chain or web given is written as
sun⇒   grasshopper ⇒   squirrel ⇒ wolf, snake or hawk ⇒  hawk or wolf 
so snakes and squirrels are eaten by hawks in this food web.
The arrow pointing towards show the predator.