Loss of habitat decreases food availability causing birds to have to work harder to survive.
(Loss of habitat; decreases; food availability) (birds; to work harder; to survive) Context(birds to work harder,List([52, 80))):(birds; to work harder to survive to survive; )
birds to work harder,List([52, 80))
Loss of habitat birds birds
decreases to work harder to work harder to survive to survive
food availability
to survive