In October of last year, I had the good fortune to visit the Asa Wright Nature Center and Tobago through Caligo Birding Tours. Trinidad and Tabago are blessed with abundant hummingbirds on both Islands, both at Asa Wright on Trinidad and at the home of Newton George on Tabago. Sometimes there are places with many hummingbirds of just one or two species, but my experience on both islands was both large numbers and a good selection of species, depending to some extent on the time of year that I visited. One of the largest and most beautiful hummingbirds that can be reliably found on both islands in all seasons is the White Necked Jacobin. While I have seen them in smaller numbers in Costa Rica, both sexes were nicely represented at Asa Wright. One of the downsides of having a fair number of both hummingbird numbers and species is the problem of “the little green hummingbird”. By this I mean, small green hummingbirds that look very similar, which usually but not always, can be identified by their limited range and/or your location. In some unfortunate locations which include Trinidad and Tobago, there are several small green hummingbirds that look similar, all in the same place. While this creates some difficulties, close observation can usually resolve ambiguities. I have included both flash and natural photographs and the ISO since I believe flash photography reveals additional aspects of hummingbird colors.
Very few organisms consume nectar exclusively over their whole life cycle, either supplementing it with other sources, particularly insects (thus overlapping with insectivores) or only consuming it exclusively for a set period. Many species are nectar robbers or nectar thieves, performing no pollination services to a plant while still consuming nectar. Nectar-feeding is widespread among birds, but no species consumes nectar exclusively. Most combine it with insects for a mixed diet. Of particular interest are four lineages of specialized nectar consuming birds in the New World: the Hummingbirds (Trochilidae) and three members of the Tanager (Thraupidae) family; Bananaquits, Flowerpiercers and Honeycreepers. These groups have adapted to permit a nectar-central diet, showing higher activity of digestive enzymes which break down sugars, higher rates of absorption of sugars, and altered kidney function. Birds need the enzyme sucrase in their bodies, in order to digest the sucrose of nectar. And most simply don’t have enough. Scientists think birds that can readily digest sugar, like warblers, have an adaptive advantage. When they fly to the tropics for the colder months, they can tap into sources of sugar that other birds just can’t handle. That sweet tooth, it turns out, is important to their survival.
This past spring I traveled to Arcata California for some birdwatching in the Pacific Northwest. In Arcata, they have a bird festival in April called Godwit Days that I could not attend. Nonetheless, I thought it might be an interesting time and place for birding. The local Audubon Society says birding is at its best from winter through early May. You’ll find songbirds in spring through fall, shorebirds, wading birds and waterfowl in the cooler months of October through April, and raptors year round. As predicted, April was not a particularly good time for water birds, although there were songbirds and plenty of spring flowers. Nearly 500 species of birds have been found in Humboldt County; many of these species are unique to Humboldt County. Fortunately I was able to secure Rob Fowler as a guide to the birding areas around Arcata. He knew when and where to look and made most of the following pictures possible. I suspect I will return in a different season to see a different set of birds and of course to see the beautiful scenery in a different light.
This past spring I decided to visit Arcata California a week after their annual Godwit Festival in April since I could not make the sanctuary festival.. The Arcata Marsh and Wildlife Sanctuary is home to the City of Arcata’s innovative wastewater treatment facility. The sanctuary is 307 acres, including freshwater marshes, salt marsh, tidal sloughs, grassy uplands, mudflats, brackish marsh, approximately 5 miles of walking and biking paths and an Interpretive Center. Located at the north end of Humboldt Bay, the sanctuary is situated along the Pacific Flyway, a major migratory route for thousands of birds that breed in the far north and winter in California, Mexico and Central and South America. The Arcata Marsh and Wildlife Sanctuary is touted as the highest bird populated coastal site between Bodega Harbor and Washington. While I had visions of masses of migrating birds the reality was somewhat more quiet. I did find a collection of Godwits, and some local ducks, egrets and shorebirds.
I happen to love woodpeckers, they are colorful, noisy and just fun to look at. Their cheerful tapping always calls to me to take a look. There are about 200 known varieties, many of which are threatened or endangered. The plumage of woodpeckers varies from drab to conspicuous. The colors of many species are based on olive and brown and some are pied, suggesting a need for camouflage; others are boldly patterned in black, white and red, and many have a crest or tufted feathers on the crown. Woodpeckers tend to be sexually dimorphic, but differences between the sexes are generally small, usually involving the head. I thought it would be nice to present these all together so that you could see and compare the various forms and colors that woodpeckers exhibit in different places. I have some beautiful woodpeckers from Africa, Costa Rica, Colorado and Arizona. Sapsuckers are also part of the Woodpecker family and I have a beautiful Red-Breasted Sapsucker from Humbolt county in California.
For those fortunate few who view a King Vulture (Sarcoramphus papa) for the first time, the experience will be unforgettable. King vultures are one of the largest New World vulture, second only to condors. It is not their size however that is visually arresting, but their bright white feathers with a vividly colored head. Certainly early native Americans would have immediately sensed the singularity of this majestic bird and would associate it with a god-like presence in their jungle world. In fact in Mayan legends, the bird was seen as a king who served as a messenger between humans and the gods. They would have observed its habit of displacing smaller vultures from a carcass and eating its fill while they wait, thus warranting the crown of a king among fellow birds. This bird was also known as the “white crow” by the Spanish in Paraguay. It was called cozcacuauhtli in Nahuatl, derived from cozcatl “collar” and cuauhtli “bird of prey”. [Read more…]
While we were visiting the Hacienda Solimar, with my Tropical Birding tour, we went one afternoon to a nearby rookery. It was located on both sides of what appeared to be an irrigation canal and the marshy environment seemed to be a magnet for all sorts of birds, but especially Wood Storks and Cattle Egrets. During the dry season water is scarce in other parts of the country. Due to this, many birds flock to Palo Verde National Park and its river basin. The park protects one of the most endangered ecosystems. It is one of the last remaining tropical dry rainforests that once covered most of Central America. Tropical dry rainforests now exist in less than 0.1% of their original size and are considered to be the most endangered ecosystems in the tropics. Palo Verde National Park was declared a Wildlife Refuge during the 1970s because of over 60 different species of birds used the Laguna, or wetland, as a migratory stop. There were once 35,000 black bellied whistling ducks, 25,000 blue winged teal, and several hundred migrating ducks during the dry season. Although Hacienda Solimar is not in the park, it benefits from the conservation efforts occurring there. The dry season concentrates the watering locations for the birds and while just about any time is good for birdwatching, the dry season makes the areas more accessible. A good example is this Wood Stork rookery we found on the grounds of the ranch in February with a large variety of birds.
As part of my birdwatching tour in Costa Rica we headed for the hot and dry Guanacaste region in the north-west of the country where we had a two-night stay at Hacienda Solimar or Solimar Lodge. Guanacaste, in the northwest of Costa Rica, is bounded on the east by a group of green-swathed volcanoes forming the Cordillera de Guanacaste and the Cordillera de Tilarán. The rivers that tumble out of these steep mountains flow down to rolling flatlands, drained by the Rio Tempisque, which empties through swampy wetlands into de Gulf of Nicoya. Guanacaste’s climate and culture are unique among Costa Rican provinces. The province experiences little rain and consistent heat from November to April, resulting in tropical dry forests as a natural adaption to the dry season conditions. Tourists seek out this dry heat during the North American winter to enjoy the beaches and Guanacaste is home to a large colony of American expatriates. The Solimar Lodge is just east of Palo Verde National Park, which is part of the Tempisque Conservation Area, that contains much of the area of the valley of the Tempisque River and covers an area of 45,492 acres in Guanacaste Province. The surrounding region is mostly tropical dry forests, and the Park concentrates on conserving vital floodplain, marshes, limestone ridges, and seasonal pools from the encroachment of civilization which was putting the ecology of the area at risk. The Solimar Lodge is just one part of the large Solimar ranch (Hacienda Solimar), one of the largest cattle ranches in Costa Rica. They specialize in Brahmin cattle which have been bred for arid terrain such as Guanacaste where cattle is raised mainly for beef.
As part of my birdwatching tour of Costa Rica with Tropical Birding, we visited the Tárcoles River, also called the Grande de Tárcoles River or the Río Grande de Tarcoles, in Costa Rica. It originates on the southern slopes of the Cordillera Central volcanic range, at the confluence of Virilla and Grande rivers, flows south-west, passing by the Carara Biological Reserve, drifts into the Guacalillo Mangrove Estuary and eventually empties in the Gulf of Nicoya in the Pacific Ocean. Although the river is somewhat polluted, it is significant for the country’s residents, as nearly 60% of Costa Rica’s total population lives along its basins. The river is perhaps best known for its abundance of American Crocodiles. It’s said that the Tárcoles River has one of the highest populations of crocodiles in the entire world, up to 25 crocodiles per square kilometer. Several tour operators take advantage of this fact by offering river tours that guarantee croc sightings. Much of the time these large reptiles (which can grow to a length of thirty feet) can be spotted swimming through the river or sunbathing along the banks. In addition to the crocodiles, the river also supports more than 300 species of migratory, native and coastal birds. Located on the Central Pacific Coast of Costa Rica, the Guacalillo Estuary and the Tárcoles River offer the chance to observe the one of the richest mangrove forests in the mid pacific coast and the most important conservation area for the Scarlet Macaw in the country.
Most tanagers are multi-colored birds of tropical forests in Central and South America. Four species including the Summer Tanager breed in North America. There are places in South America, in the foothills of the Andes, where flocks of small birds may include a rainbow palette of a dozen species of tanagers. As in most tanagers, only the male has brilliant plumage. The Blue-Gray Tanager is probably the most widespread and my personal favorite since I first saw it at Machu Picchu. Tanagers are often brightly colored, but some species are more subdued. Males are typically more brightly colored than females and juveniles. Most tanagers have short, rounded wings. The shape of the bill seems to be linked to the species’ foraging habits. I am trying a little different format, fewer but larger photos with a short description, which loads a little slower but gives you the reader a better view. Let me know what you think.