Beginning in late February or early March, thousands of migrating waterfowl stop to rest and refuel at several of the Refuge wetlands – the only ones for miles around. By May, most of the migrating songbirds are starting to arrive.
They are also dependent on the riparian corridor for refueling on the abundant insect populations. Some birds, like the yellow-billed cuckoo, stay behind to nest here, but many will continue north to their breeding grounds. Great-horned owls young are beginning to learn how to fly, while the red-tailed hawks and ospreys are just beginning to nest. Many Canada geese pairs are establishing territories and nest sites.