Scissor-tailed Flycatcher: casting a pellet

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I was quite surprised to see what looked like this Scissor-tailed Flycatcher casting out a pellet, a behavior I had no idea that this or any flycatcher species engaged in but I kept shooting as fast as possible to document it. And Birds of North America online confirms it: "Occasionally casts brownish black pellets composed primarily of chitinous insect exoskeletons" (Jonathan V. Regosin)
This series of 4 pics were taken within 1 minute (per camera time/date stamp). In the top pic the bird is beginning the process of casting the pellet which is barely visible when photos is enlarged. In the next pic the pellet is visible in the bird's mouth.
In the third pic the pellet is difficult to see but towards the front of the bird's mouth just as it begins to be cast out. And in the final pic the pellet is out and shown at the bottom of the pic. Interestingly the bird appears to watch it fall from it's mouth. SeEtta

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