Male Eastern Bluebird eating a fecal sac near its nest in Lavaca, Arkansas

Eastern Bluebirds Eat Fecal Sacs

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I photographed a male Eastern Bluebird doing something that may look odd at first. He was eating a fecal sac from the nest.

This was the first time I had photographed this behavior. It gave me a closer look at how much care goes into keeping a nest clean.

Male Eastern Bluebird eating a fecal sac near its nest in Lavaca, Arkansas
A male Eastern Bluebird eats a fecal sac as part of nest-cleaning behavior near Lavaca, Arkansas.

Eastern Bluebirds Fecal Sacs and Nest Care

Eastern Bluebirds sometimes carry fecal sacs away from the nest. At other times, they eat them.

That behavior may not seem appealing to us, but it has a purpose. It helps keep waste from building up in the nest. A cleaner nest can also reduce signs that might attract predators.

The sacs can also contain nutrients. By eating them, the adult birds recycle some of that back into their own bodies.

Both male and female Eastern Bluebirds may take turns removing or eating fecal sacs during the day. That steady care helps keep the nest cleaner for their young.

I wrote more about the removal side of this behavior in Eastern Bluebirds: Fecal Sac Removal.

Watching a Male Bluebird Handle Waste

This male Eastern Bluebird gave me a clear view of the behavior. He had a fecal sac and ate it instead of flying off with it.

Moments like this are easy to overlook. They happen fast, and they are not as colorful or dramatic as a bird bringing food to the nest.

Still, this kind of behavior tells an important part of the story. Nest care is not only about feeding young birds. It also includes cleaning, removing waste, and keeping the nest area safer.

Photographing This Bluebird Behavior Near Lavaca

I photographed this Eastern Bluebird near Lavaca, Arkansas, on April 29, 2023, at 11:00 A.M.

For this image, I used my Canon EOS R7 with the Canon RF 100-500mm F4.5-7.1 L IS USM lens. The long focal length helped me work from a distance while still getting a close look at the bird’s behavior.

Camera settings:

  • Camera: Canon EOS R7
  • Lens: Canon RF 100-500mm F4.5-7.1 L IS USM
  • Aperture: f/8
  • Shutter speed: 1/800
  • ISO: 500, Auto
  • Focal length: 500mm
  • Location: Lavaca, Arkansas
  • Date and time: April 29, 2023, 11:00 A.M.

This was a small moment, but it showed a lot about Eastern Bluebird behavior. The photo reminded me that even the less graceful parts of nest care matter.