While enjoying the open space and parks, you may encounter many different types of wildlife.
Bear, coyote and lion attacks on humans are rare. Unexpected encounters with wildlife can be prevented by talking or making noise to warn bears, coyotes and lions of your presence. Keeping your dogs leashed and controlled helps to prevent conflicts between pets and wildlife.
Remember to stay alert and aware of your surroundings. Viewing wildlife can be exciting and requires caution.
If you wish to report a sighting, call the Castle Rock Police Department nonemergency number, 303-663-6100, or Colorado Parks and Wildlife's Northeast Region Service Center, 303-291-7227
For general information or to schedule educational presentations, contact Natural Resource Specialist Barbara Spagnuolo by calling 720-733-2294 or by email.
The American Beaver (Castor canadensis) is the largest living rodent in North America. Once among the most widely distributed mammals in North America, beavers were trapped virtually to extinction in the 1800s to meet demand for beaver pelts. A subsequent decline in demand, coupled with proper wildlife management, allowed beavers to become reestablished in much of their former range, and they are now common in many areas, including urban settings.
Beavers are semi-aquatic and prefer to remain in the safety of the water as much as possible. They are fairly common in Colorado, including in urban areas. In Castle Rock, beavers are active along East Plum Creek and Sellars Gulch. However, you might not catch a glimpse of these animals as you walk along the creeks during the day, since beavers are active mostly at night.
Cutting down trees and the benefits
Beavers use the trees they cut down for food, and they use the left-over branches for building materials for their dams and lodges.
Beavers are well-known for their tree felling and dam building, which creates deep water ponds for protection from predators, for access to their food supply and to provide underwater entrances to their lodges or bank dens.
Although the felling of these trees may appear destructive, such culling can result in more, bushier growth next spring. For example, each willow stump may re-sprout three to four new stems, while poplars tend to regrow from their roots. The wetlands and large ponds created by beaver dams can have great benefits such as water cleansing, erosion abatement, flood control and more biodiversity for other wildlife.
When concerned about the loss of native trees such as cottonwoods and willows along creeks, certain individual trees can be protected from beavers' chewing and girdling activity. An easy and more effective alternative to caging and wrapping trees is to coat tree trunks with a sand and paint mixture that may prevent gnawing, as beavers may dislike the gritty feel of the sand in their mouths.
This is a great work project for scouts or other volunteer groups that requires little oversight after target trees have been identified for protection. In the last few years, the Town has painted almost 200 native trees. If your group or troop is interested in helping paint trees in Castle Rock, please call the POST Partners Volunteer Coordinator Marcy Jones at 303-814-7456.
Black bears can swim, climb trees and run very fast. They can be seen in our area at any time, day or night, often searching for food such as berries, nuts, insects and carrion. Do not feed, approach or get between a bear and its food or its cubs. Most black bear and human encounters involve food. Black bears usually are shy of humans, but some may be naturally curious.
Help keep bears wild
Bears that enter neighborhoods are typically on the hunt for food. Dry summer weather can be difficult for bears, and many of them turn to Town streets to find food. This instinct only becomes stronger as bears start to prepare for hibernation in late September and early October. (They usually begin hibernation around mid-November.)
Once a bear finds food at these locations, it becomes programmed to continue looking for food there and in similar places. In addition, a mother bear who finds food in trash cans may teach her cubs to do the same.
Here are a few tips on keeping bears and your home safe:
- Keep trash cans locked up, and don’t leave trash out overnight.
- Clean trash cans with ammonia to reduce odors that attract bears.
- Take down bird feeders when bears are active in the late summer and early fall.
- Do not leave pet food or dishes outdoors at night. Store pet food in airtight containers.
- Clean outdoor grills after each use. The smell of grease can attract bears, even if no food is present.
- Never intentionally feed bears to attract them for viewing. (It is illegal to feed bears in Colorado)
Encounters and sightings
In the past few years, the Town has seen an increase in bear sightings. If you encounter a black bear:
- Most importantly, stay calm, and do not run away
- Avoid direct eye contact, but keep an eye on the bear at all times
- Slowly back away
- Make a lot of noise
If you wish to report a sighting, call the Castle Rock Police Department nonemergency number, 303-663-6100, or the Colorado Division of Parks and Wildlife, 303-291-7227.
For more information, view Colorado Parks and Wildlife's Living with Bears brochure.
Coyotes are common in rural and urban areas throughout Douglas County. They tend to travel and hunt alone, or in pairs, but they can form groups where food is abundant. That’s why there has been an increase in coyote sightings in urban areas throughout the County.
Coyotes are curious, clever and adaptable. They quickly learn to take advantage of any newly discovered food source and are often attracted to yards with abundant fruit and wildlife to eat. They will eat pet food and knock over unsecured garbage cans, or may walk along the tops of walls and fences around homes in search of unattended dogs and cats.
Around humans, coyotes are usually skittish; they typically try to avoid people whenever possible. Attacks on humans are extremely rare. Still, Castle Rock is home to these animals, and it is important to know what to do if you encounter a coyote. Learn more about coyotes.
If you encounter a coyote:
- Make loud noises, or use yard lights or motion detectors to frighten it away
- Never feed or attempt to tame a coyote
- Do not turn your back or run
- Always keep yourself between the coyote and small children
To prevent encounters:
- Keep garbage in a tightly sealed container
- In your yard, remove pet food, fallen fruit and spilled seed beneath bird feeders
- Keep pets in fenced areas or covered kennels; keep cats indoors
- Stay with your pet outdoors unless pets are in a secured, covered kennel
- Do not allow pets to run loose
- Trim vegetation and mow tall grass; remove or thin brush and rubbage piles so as to eliminate cover for coyotes and their prey
- Completely enclose gardens and compost piles with fencing
Who to contact
Call 911 if a coyote (or any other wild animal) is presenting an immediate threat. Call Colorado Parks and Wildlife, 303-291-7227, if severe property damage has occurred or if a live coyote is trapped in your yard, garage or outbuilding.
Mountain lions are primarily solitary and most commonly found in foothills and canyon country. They are most active from dusk to dawn but will travel and hunt in daylight. They require sufficient cover in areas with a lack of human activity and are known to travel long distances in search of food. Their main prey are deer, which they hunt by stalking. They also hunt elk and porcupines, as well as a variety of domestic animals, including pets. Lions will cover their kills with dirt and leaves and return every few days to feed on them.
If you encounter a mountain lion:
- Most importantly, stay calm and do not run away
- Give the lion a lot of room
- Look as large as possible (open your jacket wide, place your arms over your head)
- Move away slowly
Who to contact
Residents of Castle Rock and Douglas County should call the Colorado Parks and Wildlife Northeast Region Service Center, 303-291-7227, if they see a mountain lion between 8 a.m. and 5 p.m. Monday through Friday. Call your local Sheriff's Office or Police Department outside those hours.
For more information, view Living with Wildlife in Lion Country.
Preble's Meadow Jumping Mouse
These rare mice have extremely long tails and large hind feet and legs. They also:
- Are primarily nocturnal but may be active during the day
- Hibernate in September or October and do not emerge until May
- Typically live in heavily vegetated riparian (streamside) habitats in Colorado and Wyoming
- Have been located in Castle Rock in or near many drainageways, including tributaries and East Plum Creek, Cherry Creek and Sellars Gulch
- Are eaten by many predators, including garter snakes, rattlesnakes, bullfrogs, coyotes, foxes, house cats, weasels, hawks and owls
- View an information sheet (PDF) on Preble’s and Endangered Species Act regulations.
The Preble’s Meadow Jumping Mouse is protected under the Endangered Species Act:
- The Preble’s mouse has been designated by the U.S. Fish and Wildlife Service as a threatened species under the Endangered Species Act. This designation prohibits the unlawful disturbance / destruction of the Preble’s mouse or its habitat. Preble’s habitat can be found in portions of Colorado and Wyoming.
- Any potential habitat within Castle Rock and Douglas County may be subject to the requirements of the Endangered Species Act. The Fish and Wildlife Service recommends sites below 7,600 feet within 300 feet of FEMA-designated 100-year floodplains be surveyed for the Preble’s mouse.
For more information, call the Fish and Wildlife Service's Colorado Field Office, 303-236-4773.
Most Colorado snakes are nonvenomous (nonpoisonous), harmless and beneficial to people because of their appetites for insects and rodents and other pests. In turn, snakes (and their eggs) are eaten by many other species, including skunks and hawks.
These snakes are venomous (poisonous) and found in grassland areas, most often sunning themselves on rocky outcrops. They prey mainly on rodents but also feed on bird eggs and lizards. These snakes rattle their tails as a warning if you approach too close but may bite as a last resort. Venomous snakes can be observed from a safe distance, as they are generally non-aggressive toward people unless startled, cornered or stepped on.
If you encounter a rattlesnake:
- Most importantly, remain calm and still at first
- Give the snake a lot of room and walk around it, or back away
- Do not handle, move or harass it
- View a brochure about rattlesnakes in Castle Rock (PDF)
- View more safety tips about rattlesnakes (PDF)
This nonvenomous snake is of the most common, and largest, of snakes seen in Colorado, but often mistakenly confused for rattlesnakes. When threatened, this snake can hiss and mimic rattlesnakes by vibrating its pointed tail to sound like a rattling tail. Bullsnakes can be identified by the oval-shaped head, round pupils and yellowish or cream coloring with dark blotches. Bullsnakes are very beneficial because of their appetite for rodents, as well as birds and bird eggs, which they kill by suffocation or constriction. They are found in a variety of habitats, including riparian areas and woodlands areas.
For more information, call the Colorado Parks and Wildlife Northeast Region Service Center, 303-291-7227. For local assistance with rattlesnakes, call the Castle Rock Police Department Animal Protective Services Division, 303-663-6100.