They are also bulky food, so a bird is better off eating more compact energy sources like seeds, fruit, or something that eats leaves ( 
(They; are also; bulky food) (a bird; is; better off eating more compact energy sources like seeds, fruit, or something) (a bird; eating; more compact energy sources like seeds, fruit, or something) (something; eats; leaves)
They a bird a bird something
are also is eating eats
bulky food
better off eating more compact energy sources like seeds, fruit, or something
more compact energy sources like seeds, fruit, or something
leaves