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Birdchick Blog: Ducks Eating Snails

Thursday, September 04, 2008

Ducks Eating Snails

Check it out: a presidential sandwich--George Washing and Abe Lincoln!

I finally have a day off from all the CivicFest and RNC madness. Civic Fest is supposed to be non partisan and some of it is. The history displays, especially about the Continental Congress are fascinating. And the First Lady Dresses--Mary Todd Lincoln had a dress make of purple velvet and black lace that today's got teenager would love for her senior prom. However, all the gift shops are all Republican, all the time, which surprised me because we have a lot of Democrats in this state and Ralph Nader and Ron Paul are here for their own respective conventions.

I'm assigned by the park service to go to these events and tell anyone that I meet about how to enjoy the Mississippi River while in town. Quite a few people (of all political backgrounds) are here and are birders. I'll find myself engaged in a great birding conversation and then at the end, finally notice they might be wearing a button on a certain political issue that I highly disagree with, but for a few minutes, we can have a common bond over our love of birds.

I will say that if you are opposed to the proposed changes to the Endangered Species Act, what an opportunity to talk to people involved! A lot of senators and Department of the Interior staff are milling about the Twin Cities and easy to talk to. I'm not allowed to talk about that with them when in ranger uniform, but once I de-ranger, I can chat away.

I can't wait until the ducks get out of their eclipse plumage. Not that I don't love a good brown bird, but they are so much prettier. For non birding, ducks go into an "eclipse plumage" when they are flightless. They molt their feathers and tend to resemble female ducks. Since they can't fly, they need to hide from predators and being brown helps you hide a lot better in vegetation. Above is a female mallard with her brood of young mallards.

Here's a male mallard--note the bill color difference...and the large snail is his about to swallow?

All of the mallards were hunting snails and swirling around each other and on top of each other to get the food.

The younger mallards were not quite as successful as the adults. They didn't come up as often with a snail and half the time they would drop it back into the water.

The adult female had her technique down--check out her bulge right after she swallowed.

This is like one of those awful shots that someone gets of you when you are mid chew--ducks lose some dignity when mid snail swallow.

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11 Comments:

Blogger Lynne said...

Looks like she's blowing you some raspberries!

9/04/2008 11:05 AM  
Blogger momo said...

Duck tongue!
I love the neck bulge shot. I remember seeing a heron swallow a fish in Loring Park and seeing the fish-shaped bulge go down its neck with the swallow. Somehow it had never occurred to me that it would show like that!

9/04/2008 2:09 PM  
Blogger Beth in NYC said...

Sharon, thanks for the eclipse plumage explanation. I had wondered about that.

I also find the snail-eating interesting. How do the ducks' digestive systems work with these? Grind up the inedible shell and digest the meaty protein and poop out what's left? I've seen images of snail kites that have incredible bills with an extreme point. They resemble human snail forks so I figured they just pick the meat out. Quite different for the ducks with their flat bills.

9/04/2008 3:05 PM  
Blogger Stacy said...

Yay! Duck Tongue! Love it!

9/04/2008 3:17 PM  
Anonymous Anonymous said...

Great post and photos but I have to confess to a little disappointment after misreading the title as duck-eating snails...

9/04/2008 11:42 PM  
Blogger Margaret Cloud said...

Nice post and I like the photos, I feed the ducks in my yard and they leave me their calling card and they make a mess out of the bird bath, stopping by to say Hi.

9/05/2008 7:04 AM  
Blogger Kirk Mona said...

Not just a presidential sandwich but a Federalist-Republican Presidential Sandwich!

9/05/2008 3:35 PM  
Blogger Kyle said...

I figured you just caught that last duck in the middle of licking her lips after an especially tasty snack of escargo.

I had heard of ducks eating snails before, but always assumed they smashed or broke open the shells to eat the squishy innards. I had no idea they just swallowed them whole.

Very cool (and educational) post!

9/05/2008 3:55 PM  
Anonymous Anonymous said...

she looks like she's choking and needs a pat on her little duckie back . . . these critter's have terrible table manners, I can attest that a stolen donut looks much the same as a lump of slug going down. . I guess if you don't have molars . .it's kinda hard to chew your food 20x b4 swallowing. they must have gizzards of iron

9/05/2008 5:28 PM  
OpenID stevie-roch said...

I know what you mean. I was out banding mallards for California Waterfowl Association last month and they were completely brown. It was like, "You're a pretty duck, but I miss your shiny green head." Although I didn't think they were so pretty when they were smacking me in the face with their wings.

And beth in nyc, ducks (and many other birds) have a specialized stomach which is separated into two sections: the gizzard and the proventriculus. The gizzard has MASSIVE muscles and, with the help of grit or rocks that the bird swallows, can grind up such things as hard seed kernels and mollusk shells.

9/09/2008 2:36 AM  
Blogger Birdie said...

I know what you mean about the brownness. I was doing banding for California Waterfowl Association last month and I was thinking, "I sure miss their pretty green heads." Of course, once they started beating me in the face with their wings I didn't care how pretty they were...

And beth in nyc: Ducks have gizzards (part of the stomach) with MASSIVE musculature. Along with the muscle, the bird also swallows rock and grit, and they use it to grind up hard materials, like seeds and, in this case, snail shells.

9/09/2008 2:41 AM  

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