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Colorado Predator Death Spiral…Curbed???

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Back in mid December, the Denver Post released an article on Colorado’s Parks & Wildlife Department and their recent decision to study the effects of more aggressive predator control on the population dynamics of ungulates, primarily mule deer (Odocoileus hemionus). As we all know, Colorado has long been known as the mule deer mecca (it takes the next three states’ Boone & Crockett Records Book entries to equal Colorado’s first place standing) yet their mule deer haven’t been immune to the crash of mule deer numbers exhibited across the West in recent decades.

Years ago I worked in the wildlife management field, first with the North Dakota Game & Fish Department as a Wildlife Technician and Private Lands Biologist and then with the Mule Deer Foundation as a Regional Director and Government Liaison. My entire life has been dedicated to a driving passion I have for mule deer hunting in lonely places and I’ve often been asked about the decline of mule deer across most of their native range.

The common question I get from other concerned sportsmen is what is the number one thing affecting the mass decline of mule deer we are seeing? Is it predation, urbanization, bad winters, drought, competition with elk and other large browsing/grazing mammals, or irresponsible energy development in some cases?

The answer is a simple one…YES! The fact of the matter is that if mule deer were only facing one or two of these adversaries, we wouldn’t be having this discussion. Mule deer, like many species of wildlife, have adapted to finite changes and disruptions to their lifestyle for their entire existence. For the last several decades, however, we have seen the “perfect storm” for these icons of the West.

In the article from the Denver Post it was reported that many wildlife groups (anti-hunting groups, mind you) including the Sierra Club, Humane Society and Wildearth Guardians were against this aggressive predator control and cited out of control urbanization and energy development as the primary cause of the mule deer decline in Colorado. While these factors are indeed to be taken into consideration, I find it the ultimate in irony that these same “conservation groups” and the people making up their membership cite urbanization as a primary factor in the loss of key habitat for mule deer, especially on the winter range, yet they are comprised of tens of thousands of people who have relocated themselves to places like Colorado to get their own “Rocky Mountain High” and be “one with nature”. If that isn’t the pot calling the kettle black, I don’t know what is.

The Colorado Parks & Wildlife needs to be applauded for taking the first of hopefully many aggressive approaches to predator management. In our era of extreme political correctness this is a breath of fresh air. I’ve personally witnessed other state wildlife management agencies who have not been so bold, either due to political pressures or naivety, and their big game populations and small game populations have plummeted because of it.

Take South Dakota for example. Their mountain lion (Puma concolor) population has been so out of control for so long that a land historically rich in mule deer is desolate thereof in our current day. In fact, the mountain lions (which kill a deer or elk a week on average) in the Black Hills have eaten themselves out of house and home and one could not even find a member of their primary food source (the porcupine) if one’s life depended on it! A decade ago conservative estimates of 200+ cats were thought to have been living in the Black Hills. If those 200 cats are killing a deer or elk a week, it doesn’t take a mathematician to quickly figure how many big game animals lost their lives to these efficient predators in just one year’s time – over 10,000!!! In addition, South Dakota’s mountain lion population is so large that the cats are traveling long and far to find new homes and new food. One radio collared cat traveled all the way to northern Minnesota and set up shop. The cats have relocated to many other surrounding states including Wyoming to the West.

This is just one example from across the West of the sheer devastation that predators have on big game herds when they aren’t managed. Nobody is saying they need to be extirpated. Sound wildlife management and land management principles exist to ensure the conservation of all wildlife species – not the management of one set of species, that is glorified on coffee mugs and as stuffed animals in tourist traps and national parks as cute, cuddly creatures, to the detriment of everything else in their paths. There is a reason predators are painted in a bad light in the age-old fairy tales we’ve all grown up with (Little Red Riding Hood and The Three Little Pigs, for example) – because they are devastating to other wildlife and man if left unchecked. A fact that urban America has definitely forgotten.

As Colorado Parks & Wildlife knows, however, predator management isn’t the only silver bullet to fix the mule deer decline. The loss of habitat due to urbanization and irresponsible energy development has merit as a topic and cannot be ignored. Urbanization is the scariest one. Energy development can be reclaimed and often is in the oil and gas industries, but housing developments are forever. Once new houses, golf courses and ski resorts move in you can kiss that habitat goodbye. Mule deer are simply running out of places to go. Throw in a nationally expanding and thriving elk herd (which does not coexist with mule deer symbiotically) plus predator numbers at record levels in our lifetimes with a bad winter and/or summer drought in the mix and you have the recipe for a disaster, which is what we’re witnessing with our country’s mule deer herds.

As I mentioned in the 2015 Colorado MRS in EBJ i88, Colorado’s mule deer population has declined 39% between 2004 and the timing of that write-up. Kudos to Colorado for now taking an aggressive approach in the right direction in the face of extreme criticism from the uneducated environmental extremists, i.e. the false prophets of the conservation world. I hope they utilize this and other land protection opportunities they can cooperate with private landowners and other agencies on to bring back Colorado mule deer to the legendary status they have been known for. We hunters, the true conservationists who have willingly contributed hundreds of billions of dollars since the early 1900’s and have passionately developed what is now known as the North American Model of Wildlife Conservation, are depending on it. As my favorite President of the United States, Theodore Roosevelt said, “Wildlife and its habitat cannot speak, so we must and we will.”

-Brandon Mason

P.S. Make sure you subscribe Eastmans’ Hunting Journal and Eastmans’ Bowhunting Journal. We just went to print with our 100th issue of EBJ and the MRS season is in full swing!


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  1. I read about a study in the Colorado Outdoors magazine on coyotes and mule deer depredation conducted by Colorado Div of Wildlife about 15 years ago. The study concluded that coyotes didn’t have a negative effect on population. But the article listed the data gathered and of the total number of fawns collared, approx 40% were killed by coyotes. How the Dept reached their conclusion is beyond incredible. The data would seem to clearly show coyotes have a negative impact. And that’s one predator. Add lions and bears and it’s a wonder there’s any mule deer left. Glad to hear Colorado is stepping up to the plate and ignoring the howls of the so called environmentalist.

  2. Garth Conroe Jr

    Fact of the matter is CDOW has never managed their deer herds! The only thing they have attempted to manage is increasing license sales every year since the 1960’s so they can justify hiring more personnel to sit behind desks in Denver and dream about how to manage mule deer so they can increase license sales!
    A bit ironic is the fact that only places mule deer populations are safe or increasing is within the City Limits of every town in Colo! Give that a little thought!

  3. Patrick Montgomery

    My problem with the CPW on the subject is why are they wasting the money and time on a study they already know the answer to? In order to increase deer populations you have to decrease Predator populations. They cite in their study proposal that because of their own rules and regulations such as no spring hunting for Bears, no baiting , no dogs for bears…coupled with no agreements with large energy companies to allow for public access, that the predators cannot be efficiently controlled through public hunting endeavors. To me and many others this is a wasted study, we all know the answers. Seems to me they are trying to use this study to justify the privatization of Predator Management, mainly give us the money and we’ll(the CPW) will get rid of the predators. They need to use this time and money to adjust the laws and statutes to put wildlife conservation back into the publics hands, the people paying for it. We already know more predators need to go, let’s get to doing it!

  4. Hunted Colorado for many years back in the late 60’s and early 70’s , around Rangely , Rifle & Meeker, Mostly on BLM land but also some private ranches……shot many trophy class Mule deer and had the place just about to ourselves……..a trip in by Jeep might be 2-3 days to where we use to start hunting or left off the prior year, then in the seventies came back and these Oil shale guys had cut roads in all over the place………you could now access these same remote areas in a few hours by passenger car…………never went back.

  5. Great comments guys. I agree with some of the sentinents, for sure. I remember when studying to get my undergraduate in wildlife biology, that I had major frustrations with nonsense studies set out to prove what anyone with common sense already knows. Unfortunately, though, these agencies swim in a political nightmare…not just normal job politics, but having to deal with pressures from elected politicians. This is super frustrating for the good guys and gals that work in these departments. However, there are a fare share of agency personnel in any system that are as worthless as they come and are part of the problem.

    Let’s all keep fighting the good fight and make our voices heard. I can promise you – the squeaky wheel gets the grease and sportsmen are terrible at sticking together and “squeakin'” as a united front. The anti’s are definitely better than us at that, sadly. They unite under their ridiculous causes and get the attention. It’s high time we squeak loudly!

  6. James M Laughlin

    Great article – spot on

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