Date: 8/6/25 10:46 am From: wagtail1997 via groups.io <orcorba...> Subject: [OrangeCountyBirding] Quick Sinking Behavior of Pied-billed Grebes at Mason
Hi Group,
Mason Regional Park has a high density of Pied-billed Grebes right now. At least 3 of the 14 are showing quick sinking behavior. I've studied that for the last two weeks and come up with videos on the behavior, analysis of the sinking, possible mechanisms, ecology, and more. All that is missing is to actually find a scientific paper on the behavior, even after doing some online searches. Anyone have a reference that I can add to the show notes? The Grebe's legs and feet have a role in the late stages of the sinking. The head behavior is interesting and lags the submersion of the rest of the body. https://youtu.be/v95FQgHPxq8 I also put up a YouTube video of a Snowy Egret following the Cormorant foraging birds at Mason.
Enjoy
Joel Weintraub
Irvine, Ca.
