Padilla Bay Shore Trail is a 2.25 dike top bicycle and pedestrian pathway. The estuary of the Skagit River is the most diverse, least disturbed and most biologically productive of all major estuaries on Puget Sound. Padilla and Samish Bay support one of the largest known wintering populations of peregrine falcons in North America, including one endangered subspecies. Ten types of raptors winter in the western portion of the County: some species include the peregrine, merlins, and snowy owls. It is reported that all five species of falcon have been observed in the Padilla Bay area on the same day.