--Day three and the shooters were waiting under the cover of pine trees for the rain to let up.... Three other groups fared better, shooting and field dressing a total of four bison.Up to 500 bison are roaming the far northern reaches of Grand Canyon National Park, trampling archaeological and other resources and spoiling the water, park officials say.... These are not big, fluffy forest cows." Each volunteer selected up to three people who were on standby to help cut up the bison and pack the