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Mountain Lion Frequently Asked Questions (FAQs)

The Colorado Division of Wildlife has provided this list of frequently asked questions in response to questions about mountain lion management in the City of Boulder.  The Colorado Division of Wildlife is responsible for the direct management of all wildlife in the state.

Mountain Lion Frequently Asked Questions

  1. Why are there lions in Boulder?
  2. What do lions eat?
  3. What is a cache and what does it look like?
  4. Why can't the Colorado Parks and Wildlife (CPW) take all lions out of town and keep them out?
  5. What does the CPW do about lions in town?
  6. Is the CPW waiting until someone is injured or killed before doing something about the lions?
  7. What are the risks to humans from lions?
  8. What can I do to keep myself/my kids safe?
    1. Can my kids play outside and walk to school unsupervised?
  9. What can I do to keep my pets safe?
  10. How can I discourage lions coming onto or near my property?
  11. Are there more lions in town now than in the past? Some long-time residents believe so...
  12. Will I encounter lions east of Broadways?
  13. Are the lions that are moving and hunting near homes and people in the city becoming so habituated to people that they pose an elevated risk?
    1. If a lion is brazen enough to kill a pet in a backyard, isn't its next logical prey a human?
  14. When are lions most active? Is it unusual to see a lion in the middle of the day?
  15. What does it mean if a lion has eartags and/or a collar? Are you tracking lions?
  16. If the CPW wants to capture a lion, what methods are used?
  17. Who should I call when I see a lion?
  18. When should I call about a lion?

 


 1. Why are there lions in Boulder?

A: The land surrounding Boulder including Open Space and Mountain Parks, U.S. Forest Service property, Boulder County Open Space properties and the private land in mountain subdivisions all provide excellent habitat for lions. 

Food is found in the form of deer, small mammals, livestock and pets.  Shelter includes not only the heavy vegetation throughout the city in yards and along irrigation ditches, but also human-made shelters such as the spaces underneath decks.  There is an abundance of water in ponds, ditches, and backyard water features (fountains and ponds).  Finally, space is available in backyards, parks, and in the ditches and creeks, which serve as ideal movement corridors for lions and other wildlife.

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2. What do lions eat?

A: Lions are opportunistic, predatory carnivores and will prey on a variety of large and small mammals, both wild and domestic. In Colorado, lions most often prey on deer, but they will also kill and feed on other large mammals such as elk and bighorn sheep. If left unprotected, domestic livestock such as llamas, ponies, goats, sheep and chickens can become food for lions. Lions will also feed on a variety of small mammals such as raccoons, foxes, coyotes, squirrels, and domestic pets. 

To minimize conflicts between domestic animals and lions, livestock should be kept in secure, fully enclosed structures, especially near dawn, dusk, and throughout the nighttime hours. When allowed outdoors, pets should be closely supervised or kept in secure enclosures (with a roof) at all times.

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3. What is a cache and what does it look like?

A: A cache is the carcass of something that a lion has killed.  When a lion is finished feeding, it will partially cover, or “cache” the kill by scraping the ground substrate (pine needles, twigs, leaves or dirt) over the carcass. The lion may leave the area until the next feeding, or may guard the cache and stay very close to it.

If you see a carcass that looks like it may have been cached, stay away and call the Boulder Police non-emergency number at 303-441-3333 (anytime) or the Colorado Parks and Wildlife (CPW) at 303-291-7227 (8:30 a.m. to 5:30 p.m.). 

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4. Why can't the CPW take all lions out of town and keep them out?

A: There is no feasible way to keep lions out of Boulder and due to the often unpredictable nature of wildlife, there are not always opportunities to remove each lion from the city before that lion leaves on its own. When appropriate, CPW officers will attempt to capture lions by tranquillizing them with a dart gun, using a baited trap, or using other techniques. Officers may also attempt to haze lions out of the city using tools such as rubber buckshot. When a mountain lion is relocated, two outcomes are possible: either the relocated lion returns to its former range, or a different lion moves into the vacated territory, which may include a portion of the City of Boulder.

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5. What does the CPW do about lions in town?

A: The CPW follows a statewide directive when responding to mountain lions in the City of Boulder.  Given the fact that situations involving wildlife are never the same and outcomes are rarely predictable, there are no simple answers for dealing with lions in town. Generally, if a lion sighting is reported in the City of Boulder an officer will respond and attempt to locate the lion.  This could be a CPW officer, a City of Boulder, Open Space and Mountain Parks ranger, or a police officer. Public safety is always the primary consideration in determining the appropriate response for lions in Boulder.  

If a lion is located, a CPW officer will respond and, depending on each individual situation, may attempt to haze the lion out of town or tranquilize the lion. If a lion kills a deer or other wildlife in a yard in the city and “caches” it (see Question 3), a wildlife officer, only with permission from the homeowner, may set a trap and attempt to trap and relocate the lion. The CPW will kill lions that are aggressive towards people, or lions that are determined to be dangerous. 

The CPW and the City of Boulder are working together to develop the most efficient avenues of notification and continue to improve communication about lions and lion activity. Boulder residents and visitors should be aware that a lion may be encountered at any time and should always take appropriate precautions to minimize conflicts with lions (See Questions 8 and 9)

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6. Is the CPW waiting until someone is injured or killed before doing something about the lions?

A: The CPW and City of Boulder officers that work in and around Boulder are committed to doing whatever they can to protect people and pets from mountain lions. They currently do so by educating and informing Boulder residents and by hazing, tranquilizing, trapping, and relocating lions when appropriate and feasible, and killing individual lions when necessary (see Question 5). The CPW cannot exclude lions from the city and cannot completely eliminate all risk to people and pets from mountain lions. To minimize the risk of lion conflicts, it is essential that Boulder residents and visitors be vigilant and responsive to lion activity in their community.

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7. What are the risks to humans from lions?

A: In Colorado, there have been two confirmed deaths and one suspected death caused by mountain lions.  All three incidents have occurred since 1990 in undeveloped areas away from towns. Four additional people were injured by mountain lions in Boulder County between 1990 and 2000, all of which also occurred outside the Boulder city limits.  Across the wider range of mountain lions in the western United States and Canada, attacks on humans are rare.

While the risk of a lion attack is low, there is still a risk associated with living or recreating in or near lion habitat.

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8. What can I do to keep myself/my kids safe? Can my kids play outside and walk to school unsupervised?

A: The CPW recommends that children be supervised when outside in lion, bear and coyote habitat. Teach your children to be aware of wildlife and what to do if they encounter wildlife.

Each individual, pet owner, and parent must evaluate the risk for themselves and make the decisions they find to be most appropriate.

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9. What can I do to keep my pets safe?

A: The CPW recommends that you always supervise your pets when they are outside. Most pets are attacked near dusk, during the night, and near dawn (see Question 14). Therefore, if your dog needs to go outside during these hours put it on a leash and go out with it— carry a flashlight, talk in a loud voice, and carefully look around your backyard before you go out. If you must leave your pet unattended outside, build a fully enclosed kennel (including a roof or sturdy fencing on top).

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10. How can I discourage lions from coming onto or near my property?

A: The first attractant is food. Mule deer make up a large proportion of a lion’s diet.  By planting vegetation that deer do not like to eat or by using landscaping products meant to exclude deer you can remove a primary attractant.

By securing your garbage properly and blocking off access to places animals might choose to den, you will also exclude species that make up the rest of a lion’s diet. The next attractant is water. Water features in a backyard are huge attractants for a variety of wildlife including lions. If you don’t want lions in your backyard then you should not have water features. 

You should eliminate any places in your yard that serve as good hiding places.  Lions are ambush predators and stalk prey from cover. Low-lying, large bushes and shrubs, spaces under decks, or any place that wildlife can rest comfortably without being seen should be removed or blocked off.  Installing outside lighting can help you see a lion if it is on your property, and may make it less inviting.

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11. Are there more lions in town now than in the past? Some long-time residents believe so...

A: The CPW does not have data to definitively answer this question. Because so many factors affect the behavior and movement of wildlife and people’s perception of it, it is difficult to do any more than speculate as to why reported, perceived, or actual lion activity in Boulder has increased or not.

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12. Will I encounter lions east of Broadway?

A: Lions occasionally travel east of Broadway, though sightings on the west side of Boulder near the foothills are much more common. Anyone residing in or visiting Boulder should be aware that they may encounter a lion at any time and in any neighborhood.

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13. Are the lions that are moving and hunting near homes and people in the city becoming so habituated to people that they pose an elevated risk?  If a lion is brazen enough to kill a pet in a backyard, isn’t its next logical prey a human?

A: Numbers have shown that throughout their range, lions choose to prey on deer and other four-legged animals and, despite ample opportunity, not on humans.

The Cougar Management Guidelines Working Group stated in 2005 that there was no scientific evidence to indicate that habituation to humans affects the risk of attack. So while mountain lions may be more visible in the city and pets are certainly at an elevated risk, there is nothing to suggest that this habituation increases the existing risk to people from mountain lions. 

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14. When are lions most active? Is it unusual to see a lion in the middle of the day?

A: Lions are most active near dusk, dawn, and anytime throughout the night. This is when they are typically moving and hunting for prey and this is when the majority of sightings, encounters and conflicts, such pet attacks, occur.  Lions can be active at any time of day or night, however, and it is not unusual for lions to be spotted during daylight hours.    

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15. What does it mean if a lion has ear tags and/or a collar? Are you tracking them?

A: Ear tags are placed on wildlife that hasbeen previously captured for any reason. Lions may also have ear tags because they were, or are currently, part of a mountain lion research study.  The ear tag colors depend on the circumstance of capture, but typically in this region of the state, lions will have green ear tags. 

The CPW is currently conducting a Front Range Mountain Lion Research Study. Lions that have been captured and put into the study will have ear tags, as well as a collar with GPS capabilities. Goals of the study include finding ways to obtain better lion population estimates, better understanding how lions utilize habitat to move between urban fringe areas and more rural, open lands within their home ranges, and finding ways to minimize human-lion conflicts.

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16. If the CPW wants to capture a lion, what methods are used?

A: When a sighting is reported, the lion typically leaves the area on its own without incident and is, therefore, unable to be located.  If a lion has a cache that can be located, (see Question 3), a live box trap may be set using the cache as bait. If a lion is free-roaming in the City of Boulder, officers will attempt to tranquilize it if it can be located and it is possible to get close enough to effectively shoot it with a dart.

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17. Who should I call when I see a lion?

A: For general mountain lion information, including recommended precautions for living in mountain lion country, call the:

  • Colorado Parks and Wildlife at 303-291-7227

To report sightings within the City of Boulder, call the:

  • Boulder Police non-emergency number at 303-441-3333; or
  • Colorado Parks and Wildlife ( during business hours) at 303-291-7227.

To report encounters, a stationary lion, or pet attacks within the City of Boulder, call the:

  • Boulder Police non-emergency number at 303-441-3333.

Call 911 in the event of an immediate human safety issue, or if a human is injured by any wildlife.

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18. When should I call about a lion?

A: You can call anytime to report sightings, tracks, or to request information about lions and other wildlife. The City of Boulder and the CPW would like to be made aware of sightings within the city limits (especially lions that are stationary for a period of time), pet attacks, and carcasses that appear to be caches (see Question 3). Any human injury caused by wildlife should be reported immediately by calling 911. 

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