Migrate, Hibernate, Tolerate – How Native Wildlife Deal with Winter

While many may think that our area does not experience a true winter, there is still a distinct seasonal change that affects our region. This change is particularly evident in the western sycamores, which transition from lush green leaves in the summer to hues of yellow and orange in the fall before shedding their foliage in the winter. Additionally, numerous plants enter a dormant phase during the fall and winter, only to spring back to life after the arrival of winter rains.

Wildlife has different options when navigating the local winter weather. Southern California is considered a Mediterranean climate, characterized by cool, wet winters and hot, dry summers. To handle the contrasting weather of the seasons, wildlife on the Irvine Ranch Natural Landmarks have adapted to either migrate, hibernate or tolerate these winter conditions. 

Migrating from the cold climate to seek warmer weather allows animals to stay active year-round. Migratory birds make their way along the Pacific Flyway, spanning from Alaska to Patagonia, in search of milder weather. Birds that migrate south for the winter away from Orange County include black-headed grosbeak, azuli bunting, ash-throated flycatcher and hooded orioles. 

Meanwhile, some native wildlife opt for hibernation or a similar process of slowing down to let the winter pass, proving to be another option for Southern California wildlife to handle the cooler temperatures. For instance, the little brown bat seeks refuge in caves or dark crevasses for hibernation. On the other hand, certain reptiles, such as the Mojave rattlesnake, undergo a state of reduced metabolic activity known as brumation during the winter. Burmation is similar to hibernation in mammals where their body metabolism slows down so they do not have to eat or drink for weeks.

Many animals in Southern California are equipped to endure the winter season, thanks to the region’s typically mild conditions in contrast to snow-covered areas. Native species have adapted by developing a thicker coat of fur or winter plumage. Coyotes, bobcats, raccoons, hawks and numerous songbirds remain in Orange County year-round and can tolerate the cooler temperatures.

In addition to the native species that call Southern California home, the region’s warmer winter climate also attracts a multitude of seasonal visitors. Monarch and painted lady butterflies migrate through Orange County from October to January. Along the coastline, blue and gray whales are commonly seen passing through this time of year to find warmer waters. Orange County becomes a stop for various species on their migratory journeys.

Amid winter, the Irvine Ranch Natural Landmarks welcomes the public to explore and appreciate the unique offerings of the season!