In early November 1805, the Corps of Discovery entered the marshes and sloughs of the Columbia's estuary, but violent weather pinned them along the river's banks for days. While camped across the river, William Clark lamented, "O! how horrible is the day." After crossing the river in search of a winter campsite, the explorers passed this site on November 26, 1805. They stopped at a nearby Cathlamet Indian village to purchase fish and wappato at what Clark considered "Imoderate pricie's," then camped near present-day Svenson. In the estuary they found evidence of the Pacific Flyway in hundreds of migratory birds. The birds provided food, a welcome change from dried fish and dog meat, but their calls also kept the party awake at night. Clark exclaimed that they were "emensely noumerous, and their noise horrid." Meriwether Lewis and William Clark were military men who faithfully followed President Jefferson's orders to carefully note the plants and animals of the West. During the winter of 1805-06 at Fort Clatsop, Lewis described 35 mammals, 50 birds, 10 reptiles and fish, and 5 invertebrates; of these, 11 mammals, 11 birds, and 2 fish were new to science.