A year of Lucifer Hummingbird sightings in Big Bend. Lines show modeled movement, not tracked birds. Data: eBird via GBIF.org, 2015 to 2025; plant data from iNaturalist.
Every March, a hummingbird about the length of your finger flies north into Big Bend and spends the summer among our agaves and ocotillos. The Lucifer Hummingbird nests in only a few corners of the United States, and the Big Bend region is the heart of that small range. We turned eleven years of birdwatchers' sightings into an animated map of its year, and here is the story it tells.
Meet the light-bringer
The Lucifer Hummingbird is small, even for a hummingbird, with a long bill that curves gently downward. Males wear a shimmering purple throat that flares out at the sides, while females are pale buff underneath. Its scientific name, Calothorax lucifer, comes from the Latin for "light-bringer", a fitting name for a bird that seems to glow when the sun catches its throat (Cornell Lab).
March: arrival in agave country
The first Lucifers reach Big Bend in early March; Texas records start around March 7 (Texas Breeding Bird Atlas). By late spring, Havard's agave sends up its tall flower stalks across the desert foothills, and agave nectar becomes the Lucifer's main food (Cornell Lab).
There is a twist in this partnership. The agave's real pollinators are nectar-feeding bats working the flowers at night (Freeman and others, 1983). The hummingbirds mostly sip without moving much pollen, so biologists describe them as nectar "thieves". They also visit penstemon, desert honeysuckle and paintbrush when those bloom.
Spring and early summer: nests on thorny plants
When nectar is plentiful, females start nesting in mid-April. In dry springs they wait for the summer rains instead. They build tiny cup nests on ocotillo, cholla and lechuguilla on the slopes between about 2,700 and 4,900 feet (Texas Breeding Bird Atlas). The first young are out of the nest by late May (Bryan and others, 2021).
Ocotillo is mostly a home for these birds. Its red flowers look made for hummingbirds, yet carpenter bees take most of that nectar, and Lucifers are rarely seen feeding there (Scott and others, 1993).
Rain matters a great deal. In the drought of 2011, fewer than 6 in 100 nests studied in the region succeeded, and the birds leaned heavily on backyard feeders (Bryan and others, 2021).
Late summer: a busy month, then goodbye
Sightings around Big Bend peak in mid-August. That peak includes the year's new young, who join the adults at flowers and feeders. Adult males leave first and are gone by early September, and the last stragglers are usually seen in October or early November (Bryan and others, 2021; Texas Breeding Bird Atlas).
They spend the winter in Mexico, along the Pacific slope of central Mexico south to Oaxaca. Winter sightings in the United States are almost unheard of: Bryan and colleagues found just one, at Study Butte in December 2013.
How we made the map
Our animation is built from public eBird sightings from 2015 to 2025, shared through GBIF and adjusted for how many birdwatchers were out looking each week. The pink haze shows where Lucifers are reported that week. The moving lines are a computer model of how the population shifts from week to week, drawn from those sightings; they are an estimate of movement and do not follow tagged birds.
One honest wrinkle: more than half of all Big Bend sightings come from a single private feeder and banding site. The year chart leaves out those feeder sites and the Davis Mountains so it reflects the wider desert. Doing so leaves the mid-August peak in place and makes it a little less sharp.
Seeing them and helping out
The best chance to see a Lucifer is between April and August in the desert foothills around the Chisos Mountains, especially where agaves are in flower. If you spot one, log it on eBird; every checklist adds to maps like ours. Planting native agaves and other desert wildflowers gives them food, and a clean, well-kept feeder helps too, since feeders appear to support many of the Lucifers we see in Texas (Cornell Lab).
References
Bryan, K., and others. 2021. Status and Distribution of West Texas Hummingbirds. Texas Ornithological Society Occasional Publication 8.
Cornell Lab of Ornithology. Lucifer Hummingbird, All About Birds (overview and food pages).
Freeman, C. E., and others. 1983. Study showing bats are the main pollinators of Agave havardiana. Madroño 30: 153.
Scott, P. E., S. L. Buchmann and M. K. O'Rourke. 1993. Evidence for mutualism between a flower-piercing carpenter bee and ocotillo: use of pollen and nectar by nesting bees. Ecological Entomology 18: 234.
Tweit, R. C. 2006. Lucifer Hummingbird. Texas Breeding Bird Atlas, citing Scott 1994, The Birds of North America 134.
Map data: eBird Observation Dataset, Cornell Lab of Ornithology, via GBIF.org (2026), downloads 10.15468/dl.6mn588, 10.15468/dl.tc8648 and 10.15468/dl.3qxwa6; plant locations from iNaturalist observations (CC0, CC BY and CC BY-NC); base map from Natural Earth. Cornell Lab, GBIF and iNaturalist do not endorse this work. Map by Magora Migration Maps, The Magora Project.
