<P> Brown pelicans and double - crested cormorants are mainly found on cliffs along the coast and on seastacks, while sandpipers and gulls inhabit the seacoast and inland areas . Inland, freshwater - dependent birds such as the common merganser, osprey, red - shouldered hawk, great blue heron, and Steller's jay are a few of the bird species that have been documented . At least 400 bird species have been documented in the forestlands . </P> <P> Reptiles and amphibians can also be found in the parks, with the northwestern ringneck snake, northern red - legged frog, Pacific giant salamander, and the rough - skinned newt most commonly seen . </P> <P> Currently, there are over 200 exotic species known to live in Redwood National and State Parks . Of these thirty have been identified as invasive species, ten of these are considered threats to local species and ecosystems . Exotic species currently account for about a quarter of the total flora in the parks . Only about one percent of plant growth in old - growth areas are of exotic species, while areas such as the Bald Hills prairies have a relative cover of fifty to seventy - five percent exotic . The type of foreign vegetation also varies, with plants such as the English Ivy (Hedera helix), Spotted Knapweed (Centaurea maculosa), and the Poison Hemlock (Conium maculatum). The spotted knapweed and poison hemlock are both under consideration for addition to a high priority watch list maintained by the park system . </P> <P> The northern coastal region of California, which includes RNSP and the adjacent offshore area, is the most seismically active in the U.S. Frequent minor earthquakes in the park and offshore under the Pacific Ocean have resulted in shifting river channels, landslides, and erosion of seaside cliffs . The North American, Pacific, and Gorda Plates are tectonic plates that all meet at the Mendocino Triple Junction, only 100 miles (160 km) southwest of the parks . During the 1990s, more than nine magnitude 6.0 earthquakes occurred along this fault zone resulting in 1 death and major financial loss, and there is always potential for a major earthquake . The park ensures that visitors are aware of the potential for a major earthquake through the use of pamphlets and information posted throughout the parks . The threat of a tsunami is of particular concern, and visitors to the seacoast are told to seek higher ground immediately after any significant earthquake . </P>

What kind of trees are in the redwood forest