Photo by David Kinneer. A juvenile (male) bluebird picks off some ripe pokeweed berries. My husband tried to get me to pull up these "weeds," but I showed him David's photos in my defense.
What bluebirds eat depends in part on what is available. On average over the seasons (based on analysis of stomach contents in the days when there were enough bluebirds around to do that), 68% of a bluebirds' diet is made up
of insects: grasshoppers, crickets, beetles,
spiders,
and caterpillars (usually spied from a perch and then caught on the ground.) (Beal 1915). They also eat ants, wasps and bees, flies, Myriapods, angleworms (Oligochaetest), snails, sow bugs (Isopodan), and black olive scales (Homoptera), moths, weevils and termites. (BNA). Bluebirds
love mealworms. Occasionally they catch insects in flight, especially when its warmer and flying insects are abundant.
The rest is mostly small fruit -
e.g., flowering dogwood, holly, mulberry, wild
grape, Virginia creeper, pokeweed, and Viburnum, gleaned from plants or foraged on the ground. (Although
they will eat the fruit of multiflora rose
and Japanese honeysuckle, these are invasive
species, and should be eradicated.)
Guinan, Judith A., Patricia A. Gowaty and Elsie K. Eltzroth. 2008. Western Bluebird (Sialia mexicana), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/510 doi:10.2173/bna.510
Study of this bird's food habits shows that the bird deserves man's freindship for economic as well as sentimental reasons.
- Frank G. Ashbrook, The Green Book of Birds of America, 1931
