The Ohlone subsisted mainly as hunter-gatherers and in some ways harvesters. "A rough husbandry of the land was practiced, mainly by annually setting of fires to burn-off the old growth in order to get a better yield of seeds—or so the Ohlone told early explorers in San Mateo County." Their staple diet consisted of crushed acorns, nuts, grass seeds, and berries, although other vegetation, hunted and trapped game, fish and seafood (including mussels and abalone from the San Francisco Bay and Pacific Ocean), were also important to their diet. These food sources were abundant in earlier times and maintained by careful work, and through active management of all the natural resources at hand. Animals in their mild climate included the grizzly bear, elk ("Cervus elaphus"), pronghorn, and deer. The streams held salmon, perch, and stickleback. Birds included plentiful ducks, geese, quail, great horned owls, red-shafted flickers, downy woodpeckers, goldfinches, and yellow-billed magpies. Waterfowl were the most important birds in the people's diet, which were captured with nets and decoys. The Chochenyo traditional narratives refer to ducks as food, and Juan Crespí observed in his journal that geese were stuffed and dried "to use as decoys in hunting others".