A Hybrid Bird at Finca Cántaros

Do birds mate with species other than their own? It seems the answer is a resounding quack in the affirmative! Writing for Science in the NY Times, C. Claiborne Ray cited findings by Irby J. Lovette, director of the Fuller Evolutionary Biology Program at the Cornell Lab of Ornithology, that 10% of the ten thousand known bird species have mated with other species, and that dabbling waterfowl, the Anatidae Family in the Order Anseriformes–that is, ducks, geese and swans–are particularly prone to having affairs with different species. Who knew?!

In early December, our Finca Cántaros groundsman, Yeimiry Badilla, a passionate birder, spotted a rare bird on Laguna Zoncho, our lake here, and mentioned it to me. Within a day or two after that, local Costa Rican naturalist guide and superb bird photographer, Pepe Castiblanco, also noticed and got a good shot of an odd bird among the Blue-winged Teal on Laguna Zoncho. It appeared to be closer to a male Green-winged Teal, but not exactly.

Birding enthusiasts began to hear about this unusual sighting, and soon a group of birders with the Asociación Ornithológico de Costa Rica showed up and declared the bird a hybrid. But a hybrid of what? Early speculation was a cross between the Blue-wing and Green-wing Teal. Before long, many visitors with spotting scopes and long camera lenses appeared at our nature reserve to observe the rare male bird. Some were fortunate and had sightings; others saw only one or more of the aquatic regulars of December through March: Blue-winged Teal and Purple Gallinule, Green Heron, Little Blue Heron and Green Kingfisher. (For many years Laguna Zoncho hosted seasonal visits of Masked Ducks, but in 2018, alas, not.)

On January 15, I was finally able to get decent photographs of the individual in question, swimming and behaving in the same way–dabbling for surface aquatic plants–and fully accepted by, his mates, the Blue-winged Teal.

Hybrid male lower right: Green-winged Teal X ?


On January 16, 2019, Finca Cántaros received birders with the tour group WINGS, led by Jon L. Dunn, co-author of various editions of the National Geographic Field Guide to the Birds of North America, including the most recent 7th edition. Accompanying him were Bob Steele, Nat Geo photographer, and Mario Cordoba, the group’s Costa Rican guide and photographer extraordinaire in his own right. Though it was the middle of the afternoon, the group had good fortune and saw the hybrid fowl. Bob Steele got a fine shot, and we may be seeing it soon in Nat Geo!

The interesting bit to me, conversing with the group at the end of their visit, was that Jon Dunn speculated that the bird is not a cross between the Blue-winged and Green-winged Teal, but instead might be a hybrid of the Northern Pintail and the Green-winged Teal. He particularly noted what seemed to him an unusually long bill, similar to the Pintail’s, but said he won’t be sure until he studies the photos he and Bob Steele took. The Northern Pintail (Anas acuta) is a rare winter resident of Costa Rica, a non-breeding migrant now occasionally seen in the northwest of the country–Palo Verde National Park and Cano Negro–and south to the Central Valley. The Green-winged Teal (Anas crecca) is called a “casual winter resident” also mostly seen in the northern Pacific lowlands, and never before in our environs of San Vito, Coto Brus.

Now I understand why so many people are coming to see this interesting hybrid waterfowl. Its parentage is a lively subject of debate, but no one will really know, unless one day it is captured and its DNA analyzed. Sorry, but that that won’t happen here where Mr. Mystery is a welcomed winter resident on Laguna Zoncho.

Mystery hybrid at Finca Cantaros’ Laguna Zoncho.

Below is an actual hybrid of a Green-winged and Blue-winged Teal, according to photographer Tom H. Ellis. This bird was photographed by him at Brazos Bend State Park in Needville, TX.

Green-winged and Blue-winged Teal hybrid, from Texas. Photo: Tom H. Ellis.



Avian Affairs by C. Claiborne Ray in Science, NY Times.

The Birds of Costa Rica: A Field Guide, by Richard Garrigues and Robert Dean, a Zona Tropical Publication from Comstock Publishing Associates, a division of Cornell University Press, Ithaca, New York, 2013.

The Sibley Guide to Bird Life and Behavior, National Audubon Society, illustrated by David Allen Sibley, Alfred A Knopf, New York, copyright 2001 by Chanticleer Press.

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Birding at Caño Negro National Wildlife Refuge

Bare-throated Tiger Heron



Recommended by many friends for years, Caño Negro, near the Nicaraguan border of Costa Rica, finally became a destination for Harry and me along with a few close friends in April, 2018. We were also accompanied by a superb naturalist Tico guide named Federico (“Fico”) Chacon. The attraction of this area of the Guatuso plains–lowlands that are seasonally flooded–is the 325 species of birds both migratory and non-migratory that visit the Caño Negro lagoon and its associated marshes and holillo (palm) groves. The wetlands are fed by the Frio River, which flows north from the Arenal Lake Basin.

Juvenile Bare-throated Tiger Heron

Heavy rains occur in the area between May and January (up to 120 inches annually), so we chose to go in April, and there was no precipitation whatsoever. Much of the birding is accomplished on the water in flat bottomed, tarp-covered boats, and the boatman are highly experienced and knowledgable about bird habitat preferences.

Black-collared Hawk


Grey-cowled Woodrail

Caño Negro National Wildlife Refuge was created in 1984. Almost 25,000 acres in size (9,969 ha), it was declared a wildlife area of international importance in 1991. The Refuge’s grasslands, forests and marshes provide habitat for jaguars, cougars, ocelots, tapirs, and sloths, among many other mammals. Our boatman recounted a recent jaguar sighting on the bank of the same river we were exploring. A European photographer had come to the area with the expressed intent of seeing a jaguar; a large male obliged by emerging from vegetation on the fellow’s first morning on the river! This news was heartening, until it wasn’t! We never did see any cats or tapirs, but we did see cavorting Spider monkeys and languid Howler monkeys.

Howler monkey and juvenile

Birding among good friends is a collaborative  interaction, everyone helping to spot and usually the guide pinpointing the exact location, so that everyone succeeds in seeing the bird–even for a brief instant. Being “in the zone”, far from the normal sounds of civilization except for the putt-putt of the boat’s motor (quickly extinguished when we wanted to drift), is almost a form of meditation. We are alert, but we are also very relaxed, in respite from all our usual preoccupations and routines. Glorious nature, unfamiliar landscapes, dawn awakenings and dappled sunrises, foggy mist and azure clarity, always the possibility of something never before seen right around the next bend in the river. Each day someone usually asks, “How lucky are WE?” And frequently, any one of us is recognizing the joy of the hunt with a cheery: “Well spotted!”

Wood Stork


Collared Aracari


Boat-billed Heron


Black Vulture, Spectacled Caiman


Black-necked Stilt, Cattle Egret, Spectacled Caiman


Green Iguana outside his lair on the river bank


Amazon Kingfisher


Chuck-will’s widow (see grayish crown); resembles Whip-poor-will


Lesser Yellow-headed Vulture


Dusky-capped Flycatcher


Black-headed Trogon


Our merry band, with escort, on our walk to the tiny pueblo of Caño Negro


Harry and a persistent pal


Horses and dog, in their element at dusk


Ficus trees adapted to annual flooding


Love and equality: a home-fashioned campaign flag in Caño Negro for the winning candidate for President of Costa Rica: Carlos Alvarado Quesada

If you decide to visit Caño Negro, we can recommend the simple, very reasonable and comfortable cabins known as Hotel de Campo, right on the lagoon with 13 protected acres (5 hectares reforested). The owners arrange boat trips. Their lodgings have a very attractive pool, and a restaurant with full bar provides creature comforts. A recommendation: the light in April is stunning.


Solitary Sandpiper




Remembering the Bush Dogs

They burst out of the understory and crossed the forest trail right in front of my dog, Melba, and me–about only eight feet away. Two identical bush dogs moving as if one animal–small yet powerful, self-contained, undeterred in purpose in the way of charismatic wild creatures–then sped east through the secondary forest of Finca Cantaros, […]

via Remembering the Bush Dogs — Finca Cántaros

Jose Pablo Castillo

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