Its topic was human-Lion relations on the northern Front Range of Colorado, where cities bump into the mountains, with a focus on Boulder County. (A National Public Radio reporter, Barron wrote that book while on a fellowship in environmental journalism at CU-Boulder.)

As Colorado moved away from treating lions as "varmints" with a bounty on their heads to game animals with a limited "take" allowed, populations had rebounded. Boulder, like many other places, had a thriving herd of in-town mule deer, especially on its western edge, and lions had followed the deer — as they do. (The usual figure you hear is that an adult mountain lion will kill a deer every seven to ten days, feeding on the carcass while it is still relatively fresh.)

The death of Idaho Springs high-school athlete Scott Lancaster, ambushed by a lion in 1991 while training for the cross-country running team, was the first recorded human kill in Colorado.

(Here is a list of post-1890 fatal lion attacks in North America, which is undoubtedly incomplete, especially as regards the US-Mexico border region.)

The attack on the young runner is key to Baron's book, as his website explains:

Here, in a spellbinding tale of man and beast that recalls, only in nonfiction form, Peter Benchley’s thriller Jaws, award-winning journalist David Baron chronicles Boulder’s struggles to coexist with its wild neighbors and reconstructs the paved-with-good-intentions path that led to Colorado’s first recorded fatal mountain lion attack. The book reveals the subtle yet powerful ways in which human actions are altering wildlife behavior.

My takeaway from Baron's book was that the Colorado Division of Wildlife (as it was then called) was willing to try some active "management" of suburban and exurban Mountain Lions, but the feedback that they got from public meetings leaned toward "Please don't kill them. We can learn to co-exist."

Have thing changed? A headline in the online Colorado Sun reads, "Mountain lions killed 15 dogs in 30 days near a Colorado town. Attacks continued and now a lion is dead."

Subhead: "People living in neighborhoods around Nederland wonder why Colorado Parks and Wildlife can’t do more to stop attacks on their pets".

In response, Sam Peterson, CPW’s Area 2 Boulder South District wildlife manager, held a meeting at the Nederland community center. Most of it focused on how to peacefully coexist with lions, but that’s not what the 140 people who attended were after. They wanted to know why lions were hiding out under porches, grabbing 100-pound Dobermans and 70-pound Labs and stalking dogs on leashes held by humans.

So the debate continues: Active measures versus careful co-existence, with residents coming down on both side and CPW reluctant — for both philosophical and budgetary reasons — to commit to sending marksmen and hounds after every mountain lion seen eyeing a dog.

Some Nederland-area residents now do their outdoor chores with firearms handy. But there's a catch. Under Colorado's "nuisance wildlife" laws (link is a PDF file),  a dog is not worth as much as a goat, for example, if the goat is classified as "livestock" and not a "pet."