Grebe pellets & submarines
The other day at Gemini Springs I watched a pair of Pied-billed Grebes swimming around the fishing pier. During a period in which they were swimming on the surface for a long period, I took a video of the little water birds, setting my camera on the pier railing. After I started recording, an Osprey flew close over where I was standing, and I lifted up my binoculars to watch it hunting.
It wasn’t until I got home that I noticed the camera captured two interesting moments with the grebes. First, right at the start of the video, one of the grebes cast a pellet!
Birds cast pellets which consist of undigested materials. I bet a lot of birders are familiar with owls regurgitating pellets; dissecting pellets is a popular educational activity for school kids and anyone can actually purchase owl pellets online for this purpose. But owls are not the only birds that cast pellets after meals. Kingfishers, corvids, herons, swallows, shorebirds and others all cast pellets of varying sizes. The pellet cast by the grebe seems quite large in proportion to the bird when I think about the size of pellets cast by Barn, Great Horned, and Barred Owls, American Kestrels, and Red-tailed Hawks (the species pellets with which I am somewhat familiar).
The other behavior I caught on video was the second grebe doing a submarine move – appearing to submerge in place, rather than a more typical flamboyant diving movement. I’ve never seen this behavior before, but it’s apparently quite normal, judging from the Google results when searching grebe submarine.
Since I was watching the Osprey while my camera shot the grebes, I didn’t get to see either of these interesting moments with my own eyes. Thank you, camera! I will pay extra attention to the grebes who seem to be settling in at Gemini Springs for the winter, and hopefully I’ll see some interesting behavior like this. Who knows?!
