Wednesday, November 21, 2007

American Avocet--Recurvirostra americana

American Avocet Couple. Notice the more upturned bill on the female on the right.

In breeding plumage, the American Avocet is one of the easiest shore birds to recognize. The cinnamon head and black-and-white wings are characteristic marks. The sexes are the same except for slightly more upturned bill of the female American Avocet. You can see in the picture above that the bird on the right is a female by her upturned bill. If you want to know how to pronounce "Avocet" click here to go to Merriam Webster's online dictionary.


American Avocet in Breeding Plumage foraging and splashing up a storm.

Also characteristic of American Avocets is the way it feeds: swinging its bill back and forth in the water like it was panning for gold. It feeds on small-sized invertebrates (animals without at backbone like little worms, microscopic zooplankton, tiny nematodes, small shrimp, insects, etc.). It also eats some aquatic plant matter. It also probes its bill into the mud to extract tasty little snacks.






American Avocets forage for small invertebrates like brine shrimp.


American Avocets can be found in wet environments like estuaries, mudflats, ponds, wetlands, beaches, and other similar environments. They breed in some coastal areas of California including Orange County and also in the Great Plains, Texas, Montana, and Canada. They are year-round residents of Orange County. Their numbers may increase in the fall and winter due to migrants who spend the winter in Southern California.





American Avocets in the shallows.

American Avocets are seasonally monogamous. They court in style, with lots of flourishes. They cross bills after mating and walk for a while together with one of the male's wing around the female according to Sibley (The Sibley Guide to Bird Life and Behavior, page 270). They can seem like a very romantic bird.





American Avocets going out for a bite to eat.




The chicks are precocial. They can be quite independent. They can feed themselves soon after hatching. Even though the chicks are so independent, the parents are strong defenders of the nesting area, and will attack predators with a powerful offense. They will also fake injury to distract predators away from the nest and young.




Group of Avocets in winter plumage. At San Joaquin Wildlife Sanctuary.

There are four other kinds of Avocet world-wide: American Avocet, Andean Avocet, Pied Avocet, and the Red-necked Avocet. American Avocets tend to be gregarious, hanging out together in large groups of American Avocets and other shores birds. I have seen them with ducks as well.



Hanging out with Pin-tailed Ducks--far right.



American Avocets are part of the family Recurvirostridae. In the United States, the only other Recurvirostridae family member is the long-legged Black-necked Stilt.

Black-necked Stilt


American Avocet


Check out American Avocets at a nearby wetlands or beach. They are here year-round and we can see them in all plumages. Try Bolsa Chica, San Joaquin Wildlife Sanctuary, or Newport Back Bay. It's a great bird to watch.



American Avocet--Recurvirostra americana from OC Birder Girl on Vimeo.


American Avocet Foraging at San Joaquin Wildlife Sanctuary in muddy shallows. Notice the side-to-side gold-panning style. The loud machinery is the construction going on. They are creating an education Center out of pre-existing buildings. Grading and other construction makes for a lot of noise near the Audubon House.


OC Birder Girl Links


Similar Bird


Black-necked Stilt--Himantopus mexicanus



Places to see American Avocets

Bolsa Chica Ecological Reserve


Central Park in Huntington Beach


San Joaquin Wildlife Sanctuary


Upper Newport Bay Ecological Reserve aka Newport Back Bay



American Avocet in breeding plumage with cinnamon head


External Resources and Links




All About Birds from Cornell: American Avocet



Article includes photographs, range maps, sound files, facts about habitat, behavior, nesting and lots more.






Animal Diversity Web: Recurvirostra americana--American Avocet




Great site from the University of Michigan which has information about birds and other animals. The American Avocet page includes lots of photographs of American Avocets, their geographic range, habitat, ecosystem roles, food habits, reproduction, behavior, and more.





Bird Web from Washington State: American Avocet



American Avocet information from the Seattle Audubon Society.



Duncraft: American Avocet

American Avocet profile with tabs for different identification, behavior and more. Very detailed with excellent drawings. Duncraft sells wild bird and squirrel products such as bird seed, bird feeders, bird houses and more. It has a bird guide on its site that is very good. Site worth checking out.




Nature Works: American Avocet - Recurvirostra americana

Information on the American Avocet.



Oiseaux .net: American Avocet



French site with English version. Includes world range map, physical description, voice, behavior, flight, habitat, reproduction, food habits and more.



American Avocets in black-and-white winter plumage.


Links to Journal Articles





Effects of Management Practices on Wetland Birds: American Avocet

Lots of information about migration, preferred habitat, brood parasitism, and more. All geared toward looking at the species response to wildlife management practices.


Egg Shell Removal Behavior of American Avocets and Black-necked Stilts

A study of interesting American Avocet and the closely related Black-necked Stilt behavior and the reasons it might occur.




Apparent Hybrids between the American Avocet and Black-necked Stilt in California



An article and photo of apparent cross-breeding between two closely related species.




Historical Changes in the Abundance and Distribution of the American Avocet at the Northern Limits of Its Winter Range



Provided by SORA from Western Bird, article discusses several changes that may explain changes of range at one location in Humboldt Bay, California.



American Avocet foraging



Photos


Smithsonian Migratory Bird Center: American Avocet Photographs




Two Photographs from the US Fish and Wildlife Service


American Avocet in Breeding Plumage Courtesy of the US Fish and Wildlife Service.






American Avocet in plumage between breeding and winter. Might also be a juvenile. Courtesy of the US Fish and Wildlife Service.







Video



Internet Bird Collection: American Avocet





Bird Cinema: American Avocet Winter Plumage














See OC Birder Girl Store on Amazon.



Subscribe to My Birding Blog: Posts (Atom)



Back to the home page



Newer Posts Older Posts

Mallards--Anas platyrhynchos


Male Mallard striking a pose. (At Central Park West.) Notice the yellow bill.



Female Mallard stepping out (at Central Park West.) Notice bill is orange with black on the top surface.


Mallards are the most common duck in the world. They are the ancestor of all domestic ducks with the exception of the Muscovy Duck. Because of this fact, Mallards cross breed with domestic ducks and some subspecies of the Mallard are in danger of disappearing due to Mallard cross breeding. The male Mallard is a handsome fellow and does attract a lot of female ducks.




Promenading at Huntington Beach's Central Park.



Mallard ducks are dabbling ducks. Dabbling ducks use their bills to filter water and food. They also tip upside down and their heads disappear beneath the water as they nibble on aquatic plants growing on the bottom of marshes, estuaries, streams, and wetlands of all kinds. All remains above water are a lot of feathery fannies. Every once in a while dabbling ducks come up for air.





A Mallard Couple Huntington Central Park.


And another Mallard couple at Tewinkle Park in Costa Mesa.


Mallards also eat seed, larvae, aquatic invertebrates, grain, insects, and plants. They quack loudly and can be aggressive with other ducks and each other. They are often on the grass by the water, and free handouts from people cause ducks to come swimming, running, and flying to get in on the free bread.






Popular male mallard at Huntington Central Park.


You will often find Mallards mixing with American Wigeon and American Coots at neighborhood parks. Several species of dabbling ducks in wilderness areas or marshes tend to congregate in mixed groups while feeding. Yet in spite of the gregarious nature of ducks, many of the "Park-Ducks" you see are actually domestic breeds of ducks and not just Mallard hybrids. Some of them look pretty "accidental," but they were bred that way.






Very large female Mallard in the front and a very large male Mallard in the back. Near Alice's in Huntington Central Park.


A few years ago I began to notice large Mallards mixed in with the others at parks. One yahoo poster noticed them, too, and wrote in to ask what the deal was with the "Freakishly Large Mallards."





He's a big fella. (Right lower corner.) Huntington Central Park.

I have called them "Baby Hughie Mallards", "Radiated Mallards," and "Mallards on Steroids." Above and below several photos of "Freakishly Large Mallards." (I really like that phrase the best.) These are not optical illusions. These birds really are that big.



Large Male Mallard hybrid tells little female, "Stay out of my way, Pee Wee." Huntington Central Park.


So what is the story? Is it as one responder to the "Freakishly Large Mallard" post thought: Just a hormone problem? Or as another thought: Too many free lunches? I think the most reasonable answer I have heard is that they are domestic ducks. Either hybrids of Mallards and large domestic ducks or escaped Rouen ducks. Rouen ducks are domestic ducks that have Mallard Markings. They are very large. Some people say domestic ducks have a way of escaping or being released by some breeders when they don't meet breed standards. I don't know if they escaped or were released, but they are showing up all over the parks in LA and Orange Counties and beyond.



The Green-headed wonder. Huntington Central Park.




Crested Duck at Lake Balboa in the San Fernando Valley. A very odd duck.



Recently, I have seen some birds that have a weird growth on their heads. I thought it was a tumor or some awful disfiguring disease. But no. It is actually a crested type of duck bred to look like that. They show up in the park especially it seems when their bobble crest thingy is off center or otherwise falling short of the mark for the breed. And there are other ducks, as I have mentioned, sporting patterns or shapes that seem to be "mutts," but really are members of a specific duck breed. Go figure. Do a search for "Crested Ducks" or "Crested Rouens." Check out the links under "Strange-Looking "Mallard-like Ducks." You will see some strange looking ducks. Also see my posts on Odd Ducks and Wild Ducks of Orange County.

Male Mallard on the left in eclipse plumage and one on the right in breeding plumage.

Ducks have what's called eclipse plumage usually in the summer. Eclipse plumage is the plumage they have as they molt and lose their breeding plumage. Then the breeding plumage grows back with new fresh feathers. Notice that the male and female look very similar at this time of year. Compare below.

Female Mallard. She has an orange bill with black on the top surface.

So how do you tell the difference? First, the bill. Male Mallards have yellowish bills with a black spot on the tip of the bill, but otherwise not a lot of black on the top surface. But the female has an orange bill with a lot of black on the top surface. Also the male may have some residual green specks left on his head, and a more chestnut-colored chest. The male also has a bit of a curl in his tail feathers, but it is not always seen in eclipse plumage. Telling the difference between male and female Mallard in the summer is not really so difficult when you know what to look for.

They look so cute. Baby Mallards. They usually lay about a dozen eggs. Huntington Central Park East.


Mallards are pretty ducks. They seem so simple and yet can be so complex. The most hunted duck, and yet the most common. A species that is so successful that it creates a problem for other species. When you see Mallards, remember the many things about them that make so interesting and make them so much more than "common." Even common birds can be fascinating as you study their behaviors and become familiar with the species. Don't focus so much on your Life List that you miss out on the beauty of bird behavior. Knowing the behavior and little habits is more than half the fun of birding!



Mama and babies. Huntington Central Park on the East side by the Library.

So whether you are birding in Orange County in Bolsa Chica Ecological Reserve, San Joaquin Wildlife Sanctuary, or just a community park, if you are near water, watch for the Mallard and remember to stop and watch this common, but interesting bird. Have fun birding in the OC!




A more natural setting at San Joaquin Wildlife Sanctuary.




Links

All About Birds: Mallard

Lots of information.





US Geological Survey: Mallard Anas platyrhynchos

Good article. Has a link to a short video of a Mallard on the left side.





Animal Diversity Web

Their usual thorough article.





MallardAnas platyrhynchos

From the Audubon Society. Article on the conservation status of the Mallard. Lots of information. Make sure you read information on both tabs.





Mallards and their Ducklings

Good article on Mallards and their ducklings and what to do as a home owner with Mallards on your property. From Orange County's Sea and Sage Audubon Society Website the Article is from a Wetlands Wildlife Care article.






Nature Works: Mallard - Anas platyrhynchos

New Hampshire Public Television series Nature Works website. This article covers the Mallard very well.





oiseaux.net: Mallard

Oiseaux.net is a great site with lots of information. It is a French site that has an English version. Good articles, games, and information about birds worldwide. The information comes from ornithologists and naturalists.



Pairing in mallards and American black ducks by Eugene S. Morton

A study published in the Animal Conservation (1998) 1, 239–244 © 1998 The Zoological Society of London Printed in the United Kingdom. Morton studied the decline of the American Black Duck in Relation to the Mallard in Chesapeake Bay in New York. Some interesting observations.



Neophobia

A Study by the Smithsonian's Migratory Bird Center on ducks and neophobia or fear of new things. Complete with videos. Interesting on many levels.



Living with Urban Mallards

From the Audubon Society in Portland.Lots of good information that answers many question people may have about Mallard Ducks.




"Strange-Looking "Mallard-like Ducks"


Crazy-looking White Duck--What is this thing? from Birder's World

Until I saw this article, I thought ducks like this had some awful disease. We are seeing more and more of them. No, it's not a tumor on the duck's head. These poor ducks are actually bred for this weird bobble on the head. Do a search for Crested Duck and Crested Rouen and see what you find. Odd, but true. Breeders may be releasing the ones who don't have the bobble or crest centered on the top of their heads. Or they may just be escapees.



Confusing Domestic Ducks (and hybrids) from Cornell

Good article form Cornell about different confusing ducks you may see.

Rouen Ducks from Feathersite.com


Check out these large ducks. They look like incredibly large Mallards.



Omlet UK: Ducks

Check out this domestic duck site. Ducks you thought were mutts may turn out to be an actual breed of domestic duck.





Newport Back Bay.





Photos


Smithsonian Migratory Bird Center: Mallard Photos








Videos

Internet Bird Collection: Mallard

Collection of free bird videos. Has about 27 Mallard videos. It is always good to study a bird in action.




See OC Birder Girl Store on Amazon.

Subscribe to My Birding Blog:
Posts (Atom)

Back to the home page

Newer Posts Older Posts

Parts of a Bird



Parts of a Bird (Original Image by IMSI used by permission.)

Being able to identify a bird in the field begins with knowing the parts of a bird. Above is a very simple example I created by labeling an image. You will find the parts of a bird, or bird topography in the front of most bird field guides. The additional links below should be of assistance as well. Practice until you know them well. Then you can begin to note the shape, color and plumage in relation to the part of the bird. It will help you not only identify a bird, but discuss it with other birders.

External Links and Resources


All About Birds from Cornell University: Bird Topography

Parts of a bird.

 

Bird Identification
From wildbirds.com, a page on how to identify birds and parts of a bird labeled.
Bird Morphology I from the Merriam Webster Visual Dictionary


And

Bird Morphology II from the Merriam Webster Visual Dictionary

Great resource shows pictures and great details what the parts of a bird are called with lots and lots of illustrations. It is the Visual Dictionary after all. Check out the main article on birds for more detailed information on shapes of bills, wings, feet, and bird anatomy. Plus it has pronunciation icons for the terms so you can click on them and hear how to pronounce all the bird morphology terms. I lived in the San Fernando Valley for years, so I have to say it: "Awesome!"



Topography of a Duck

Listing of parts of a duck.





OC Birder Girl Links


Birding Hot Spots in Orange County, California

Birding Code of Ethics from American Birding Association


Beginning Birders in Orange County

Pishing

Book Review: Good Birders Don't Wear White


Orange County Bird Checklists

The Christmas Bird Count

Bird Guide Reviews

Central Park after the Rain

Wood Duck or Mandarin Duck?


What Birds Eat--Terrestrial Invertebrates









See OC Birder Girl Store on Amazon.









Home - Index - Contact - Shop -


Ask the OC Birder Girl