The different habitat can make some difference, but the prey has to come out of cover sometime. A few years ago the pheasant biologist told me that we need more continuous switchgrass cover. I thought this was odd as back in the pheasant heydays, I never remember seeing a blade of switch grass anywhere. He then told me that the switch grass was to provide protection from the avian predators that killed the most pheasants. I should have asked how to combat the problem of owls killing them out of roosting trees. All this round about way of trying to bring back small game, through habitat, since raptor were protected and increased in uncontrolled numbers is not working. Control predators, based on numbers not red tape and emotions. This is the way most other animals are hunted and controlled.