Science Corner - Black Phoebe

Kristie Ehrhardt • February 6, 2025

‘Round about the time that most little kids start learning the sounds that farm animals make (I can still hear the old “See and Say”), my daughter was learning what sounds different birds make. Her first word was turtle so it seemed natural that she would later pursue a biology degree - why not get started early. A little while later, as a biologist’s budding biologist kid, she was learning to identify birds. One species we frequently saw together was the Black Phoebe. I’m not sure why it’s this little bird in particular but every time I see one flitting around I think of her and smile.

 

Black phoebes (Sayornis nigricans) belong to the flycatcher family (Tyrannidae). With over 400 known species, flycatchers are the largest family of birds in the world. Flycatchers do just as their name implies and fly around erratically in hot aerial pursuit of flies and other winged insects. Black Phoebes are plump, smallish (between the size of a sparrow and a robin) songbirds weighing about a half to three quarters of an ounce and measure a little over six inches long. Our only black flycatcher, they are fashionable little birds with an elegant sooty black and white plumage, a relatively large head with a peaked crown (of course they have a crown!), a straight pointed beak with a tiny hook at the end and long, square-tipped tails. They have predominantly black plumage with a white underbelly that forms an inverted “v” where the black and white join on the lower breast. Males and females look the same and their plumage does not vary by seasons. Juvenile birds look like adults but are white and dark brown which becomes black with age.

 

Black Phoebes are mainly resident birds in Western United States from Oregon to Mexico, Central America and parts of South America. However, the populations located in higher elevations migrate somewhat with the seasons. They can be found in a variety of habitats including creeks and streams, canyons, farms and urban areas and parks. Black Phoebes often sit conspicuously on exposed perches and branches making short flights to catch insects and then often returning to their perch. They are easy to identify by their persistent tail wagging and bobbing. Black Phoebes have a relatively long breeding season beginning in March lasting through to about August and are typically monogamous with pairs remaining together for five years or more. Courting males will conduct impressive inflight displays that include calling and fluttering nearby where the female is perched. If she plays hard to get and flies away, he will often follow her. Territorial spectacles include tail flaring and fluttering and zig-zagging or spiraling to 100 feet or more in the air and then descending. Males take the female on a tour of potential nest sites and the female chooses the location and does most of the nest building herself. Nests are made primarily of mud mixed with grasses and weeds lined with soft material such as plant fibers, rootlets and hair. They are cup shaped and are anchored somewhere sheltered like the underside of a bridge, the eaves of a building or a protected cliff face. The female lays three to six eggs and only she incubates them. The eggs hatch after about 15 days and are cared for by both parents. Fledging happens in about two to three weeks and usually a pair will have two broods a year using the same nest year after year.

 

Black Phoebes forage by sitting on a perch and darting out to catch insects in mid-air, sometimes just above the water similar to swallows. They may also hover over plants picking off insects or take them off of the ground. Black Phoebes’ diet consists almost entirely of insects including bees, beetles, crickets, flies, grasshoppers and moths but they will occasionally eat small fish such as minnows or mosquito fish.

 

Fun Facts

  • House Finches invaded an established Black Phoebe nest and both species laid eggs in the same nest. The females took turns incubating the nest with each others eggs for about a week but eventually both of them abandoned the nest.
  • The oldest Black Phoebe was over eight years old and was banded and later recaptured in California in the early 80’s.
  • Black Phoebes do not use bird boxes but if you provide a nest platform in a safe location you might be lucky enough to have a pair set up house in your yard! move in huge groups to find new berry supplies.


-Kristie Ehrhardt (kehrhardt@tuleyome.org)

Tuleyome Land Conservation Program Manager

RECENT ARTICLES

By Ellen Jenkins July 2, 2026
From left to right, Horticulture Interns Ellen Jenkins, Rithika Warrier, and Diego Barraza Hernandez, with Education Associate Geoff Benn, who coordinates the internship program. From September to June, I worked as a Horticultural Intern at Tuleyome. Each week at the Woodland Regional Park Preserve, I would meet with my mentor Teri Barry. Over the course of the year, we worked together identifying, documenting, and analyzing the preserve's growth. Through this opportunity, I gained experience in hands-on restoration efforts, familiarity with plant taxonomy and classification, and community outreach.
By Kristie Ehrhardt July 2, 2026
I’m sure you already know that the Bald Eagle is used as a symbol of our Nation’s freedom, strength, perseverance and independence. It is said that our founding fathers chose the Bald Eagle to adorn our Great Seal because it is indigenous to North America and if you look closely at it, you’ll see that it is holding 13 arrows and an olive branch simultaneously symbolizing the power of war and the power of peace. But, what about our national mammal? Er, maybe you didn’t even realize that we had a national mammal… President Barack Obama designated the American Bison as our national mammal in May of 2016. It too is endemic to North America and in prehistoric times, millions of them roamed through roughly two-thirds of the United States. Their range was known as the “great bison belt” - a stretch of habitat that encompassed the forests of Alaska, the grasslands of the North American plains and stretched from the Great Basin east to the eastern Appalachian Mountains. Side note - I’m just gonna come clean right now and tell you that the historic range of the American bison, American Buffalo or just plain bison or buffalo does NOT include the Berryessa Snow Mountain National Monument (Monument). I’m supposed to be writing about the Monument region and I picked a topic that is clearly not there but it’s important and they are impressive so please don’t tattle. Another side note - the American Bison and the American Buffalo are one in the same and both names can be used interchangeably. Its scientific name (genus and species) is actually Bison bison so I guess calling them bison is probably more scientifically accurate but either works. Bison are North America’s largest land animal; an adult male averages about 2,000 pounds - that’s a ton (thanks Schoolhouse Rock, I will never forget this one!), are about 12 feet long from nose to rump and about six feet tall. Females max out at around 1,000 pounds and are a little over nine feet long. In the wild bison can live ten to twenty years. Both females and males have massive forequarters and sport what looks like a shaggy, long-sleeved sweater. Both sexes have short, curved horns that are an integral part of their status in the herd and defensive strategy. During the snowy winters, bison display a dark brown winter coat and in the summer they show off their lighter brown summer-bods. Calves typically arrive from March through May depending on weather conditions. When they’re first born calves are an orangey-red color which earned them the nickname “red dogs”. Within a few months they become darker brown like their parents and their little horns start to poke through. Around this time they also begin to develop their iconic shoulder hump. The hump is made of solid muscle buttressed by elongated vertebrae. This dense network of muscles act as a powerhouse that allows the animal to swing its massive head from side to side and plow through icy snow to access buried forage enabling them to survive even the harshest winters. Although they are not known for keen eyesight, bison have superb senses of hearing and smell. As monumental (get it?) as these animals are, they are shockingly quick and agile. Bison have been clocked at running 35 miles per hour (!), they can spin and turn on a dime, leap over high fences and are incredibly adept swimmers. All these mad skills on a strictly vegetarian diet - that’s ruminant efficiency. For thousands of years, before the European settlers arrived, Native Americans of all tribes and regions revered the bison. They were the cultural, spiritual and resource backbone of indigenous societies across the United States. Every part of the animal was used; the meat was consumed, the hide was used for clothing, shoes and shelters, and the bones and hooves were used for tools and weapons. Even the sinew was used for sewing and bow strings. Everything was copacetic then came the Europeans with their domestic cattle diseases and thoughtless greed. Bison were hunted to near extinction within roughly just 100 years. Their numbers went from an estimated 60 million (!) to less than 550 individual animals by 1889. They were hunted mercilessly and their habitat destroyed, some say as a way to control the Native Americans by removing their primary resource. One of the buffalo’s biggest fans was President Teddy Roosevelt. In the early 1880’s he traveled to what is now North Dakota (shout out to my people!) to hunt. After recognizing the bison’s diminishing population numbers he co-founded the American Bison Society in 1905 to help conserve and protect this American emblem. For many years the few buffalo that remained were only found in national parks and preserves but primarily on Native American reservations. Had it not been for the willingness of tribes across the country to work with interested individuals and state and federal governments, the American Bison would be gone today. Much like the Bald Eagle, the bison is an authentic symbol of American character and as it turns out, another one of the greatest conservation success stories in U.S. history. The bison within the Yellowstone National Park boundaries are direct descendants of the original animals that roamed our country’s grasslands and are the only herd that still occupy their original prehistoric location. This free-ranging herd numbers approximately 5,500 animals and is the largest herd on public land. Recovery efforts paid off and today bison can be found in all 50 states including private and tribal lands, national parks and wildlife refuges.