BCAS Articles
July Nature Almanac: Meadowtation
Why sacrifice blood to mosquitoes who are out whining and dining in wet meadows in July? Fireflies, snipe, and bobolinks are three good reasons.
June Nature Almanac: Variegated Fritillaries Invade Foothills Grasslands
The common name variegated fritillary describes the complex pattern of orange, brown, and buff scaling on the underwings.
May Nature Almanac: Tyrannical Western Kingbirds Rule!
A gray bird with a lemon-yellow belly and lots of attitude flies out from a perch and chases off an intruder. This vocal defender of territory is a Western Kingbird.
April Nature Almanac: Flutist of the Prairie
The West is home of one of the best songsters in the world, yet we often take this prairie crooner for granted. Of course, we’re referring to the Western Meadowlark, the master singer of any worthy pasture, open-space parcel, or grassland along the Front Range.
March Nature Almanac: Early-Appearing Saw-whet Owls Face Deep-Freeze and Feral Cats
Standing just 5.5 inches tall and weighing less than 4 ounces, Northern Saw-whet Owls need to consume close to 20% of their body weight each winter day to keep body temperatures from plunging.
February Nature Almanac: Manzanitas Bloom for Christmas… and for Valentine’s Day
We think of manzanitas as being emblematic of California. However, Panchito manzanita is native to the Uncompaghre Plateau in western Colorado. It is well adapted to a dry climate and fluctuating temperatures.
January Nature Almanac: Red Crossbills Usher in the New Year
Hardy creatures, crossbills are able to withstand the harshest winter weather nature can bring on, as long as food remains available. A finch relative, they are found throughout the foothills and mountains of Colorado.
December Nature Almanac: Cedar Waxwings Embrace Suburban Life
When we first settled in Boulder more than a half-century ago, we would have been startled and thrilled to see a Cedar Waxwing in our backyard. Now we see or hear them throughout the year -- flocking to junipers, dangling from berry-laden mountain ashes, or visiting our backyard bird feeders.
November Nature Almanac: Defective compass may send disoriented migrants our way
In the autumn and early winter of 2018 local birders became excited by birds that should not have been here. Winds probably helped push these out-of-place birds north that year, but another cause may be a phenomenon called “reverse migration” that happens when a bird flies in the opposite direction from their usual route.
October Nature Almanac: Irascible Mud Hens
They've been here all summer, and they'll probably be here all fall and winter too—those noisy little dark, duck-like birds that like to dabble around in the wetlands of eastern Colorado.
September Nature Almanac: Pine Whites Float on Late Summer Breezes
When out looking for butterflies in the foothills, we typically scan wildflowers blooming along either side of the trail, alert for flashes of orange or yellow. But during September, if you look straight overhead, you're likely to see a striking butterfly flitting through the conifers.
August Nature Almanac: Ebony Jewelwings Dash and Flash Above Languid Streams
Like turquoise and emerald wands with ebony wings, jewelwing damselflies (Calopteryx maculata) make us catch our breath in wonder.
July Nature Almanac: AcroBats Over Boulder
Ten species of bats breed in Boulder County! Learn more about their activities throughout the year and where you can see them in July.
June Nature Almanac: Bobcats Emerge from the Shadows
During our first few decades living in Boulder, we hardly ever saw a bobcat. Now friends and neighbors seem to report encounters with these mostly nocturnal felines almost daily.
May Nature Almanac: Enticing Avocets
Each spring flocks of shorebirds traveling through eastern portions of Boulder County search for places to stop over to refuel before continuing northward to breeding areas on the arctic tundra. Other shorebirds remain here for the summer, setting up territories in the few suitable habitats that remain. One such species is the appealing American Avocet.
April Nature Almanac: Bluebirds Make Our Hearts Sing
How did bluebirds acquire their dazzling color? Once upon a time, according to folklore, all the birds and animals were painted but one. The forgotten bird flew up into the sky to protest its drab coat, and bits of sky stuck to its feathers. Today, we still thrill to see that dazzling color whenever we see a bluebird.
March Nature Almanac: Pampas Hawks Arrive on Schedule but Find Fewer Vacancies
For millennia, pampas hawks (Buteo swainsoni) have lived geographically symmetrical lives, wintering in mid-latitude grasslands of Argentina and nesting in mid-latitude grasslands and desert shrublands of western North America.