Wild South Florida — Purple Swamphen
 
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Purple Swamphen
purple swamphen
Purple swamphen, photographed at Green Cay Nature Center, Boynton Beach, Palm Beach County, in January 2015.
purple swamphen
 

At first glance, it looks like a giant, mutant purple gallinule. Upon further review, as they like to say in the NFL, it's clearly something else, given the red forehead shield, red legs, ground hugging habit — and overly large body. So what is it? The purple swamphen, of course.

If you haven't heard of this bird, AKA Porphyrio porphyrio, you're not alone. In the United States, it's a rare bird, found wild only in Florida — Miami-Dade, Broward, Palm Beach and Hendry counties, mostly. But it is not native to North America, let alone Florida.

As one theory goes, during the 1990s someone in Pembroke Pines kept the birds as pets and let them roam freely. From there, who knows? A second theory has the birds escaping from their Pembroke Pines owners in the aftermath of Hurricane Andrew in 1992. A third also involves Andrew: the Miami Zoo had purple swamphens, part of its "Wings of Asia" exhibit, eight of which managed to escape during the hurricane.

But it's not even clear that all the birds are same type — there are 13 subspecies of swamphens, two of which apparently are roaming around Florida. There are swamphens with blue heads, swamphens with gray heads. The grays, P. porphyrio poliocephalus, are a subspecies native to a region that extends from Turkey and the Caspian Sea to Sumatra in Southeast Asia. The blues are a different subspecies altogether.

 
 
swamp hen
 

Their numbers are still relatively small and it's unclear what impact their presence has had on native species. Swamphens are extremely territorial and aggressive birds. They could become competitors for food and habitat. Their impact could extend even to plant life, fish and other aquatic critters.

And there's this: According to the Global Invasive Species Database, in places where swamphens are invasive, they are known to eat the eggs of other birds.

At least as far back as 2003, proposals were floated to eradicate the birds while their numbers were still small. In 2010, Field and Stream magazine reported that Florida officials were considering a swamphen hunting season. By 2010 or so, about 3,000 swamphen had been "removed" from the wild, according to a University of Florida fact sheet. The UF report said although swamphens are mostly confined to South Florida, they are quite mobile and could spread elsewhere. Isolated birds have been spotted as far north as Lake, Osceola and Brevard counties.

 
Photographs by David Sedore
         
swamphen map

 

As noted above they are large birds. A swamphen can be as long as 18 inches, with a wingspan reaching or exceeding three feet. They can weigh as much as a pound-and-a-half. A purple gallinule, by comparison, might reach 15 inches in length, with a wingspan of 22 inches and weigh about a half-pound.

Besides size, the clearest way to separate swamphens from their cousins is their bill and frontal "shield." The purple swamphen has a red bill and shield, whilte the gallinule has a bill that is red with a yellow tip and a light blue shield. Moorhens have the same red shield as the swamphen, but its bill is red with a yellow tip.

Swamphens nest in shallow water amid dense vegetation, sometimes on platforms, sometimes floating. Both sexes build the nest, weaving dead vegetation together. They might build several nests, selecting the most concealed as the place to lay the eggs. Females can lay two clutches a season, each with two to seven eggs, which take three to four weeks to hatch. The parents split incubation duty.

The American Birding Association added the swamphen to its checklist for bird watchers in February 2013. Swamphens are members of Rallidae, which includes gallinules and moorhens

The map at the left shows locations where purple swamphens have been spotted. The red outlines natural areas and preserves, while the blue dots are agricultural areas. Map produced by the University of Florida.

 
 
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