Monday, 24 April 2017
Sunday, 23 April 2017
26-3-2017 RANCHO NATURALISTA, COSTA RICA - WHITE NECKED JACOBIN (MALE) (Florisuga mellivora)
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The white-necked jacobin (Florisuga mellivora ) is a medium-size hummingbird that ranges from Mexico south through Central America and northern South America into Brazil, Peru and Bolivia. It is also found in Trinidad & Tobago.
Other common names are great jacobin and collared hummingbird.
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The white-necked jacobin is 11 to 12 cm (4.3 to 4.7 in) long. Males weigh 7.4 to 9 g (0.26 to 0.32 oz) and females 6 to 9.2 g (0.21 to 0.32 oz). The male is unmistakable with its dark blue head and chest and white belly and tail; the tail feathers have black tips. A white band on the nape separates the blue head from the bright green back and long uppertail coverts. Females are highly variable, and may resemble adult or immature males. The majority of females have green upperparts, a blue-green throat and breast with white "scales", a white belly, and a mostly green tail with a blue end. Immature males vary from female-like, but with more white in the tail, to male-like with more black there. Immature females also vary but usually have less white in the tail and are somewhat bronzy on the throat and chest.
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The nominate subspecies of white-necked jacobin, F. m. mellivora, is found from southern Veracruz and northern Oaxaca, Mexico, through southern Belize, northern Guatemala, eastern Honduras and Nicaragua, eastern and western Costa Rica, and Panama into South America. In that continent it is found in much of Colombia and Ecuador, eastern Peru, northern Bolivia, most of Venezuela, the Guianas, the northwestern half of Brazil, and the island of Trinidad. F. m. flabellifera is found only on the island of Tobago. The nominate has been recorded as a vagrant in Argentina and on the islands of Aruba and Curaçao.
The white-necked jacobin inhabits the canopy and edges of humid forest and also semi-open landscapes such as tall secondary forest, gallery forest, and coffee and cacao plantations. It is usually seen high in trees but comes lower at edges and in clearings. In elevation it usually ranges from sea level to about 900 m (3,000 ft) but has also rarely been seen as high as 1,500 m (4,900 ft).
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The white-necked jacobin's movement pattern is not well understood. It apparently moves seasonally as flower abundance changes, but details are lacking.
The white-necked jacobin feeds on nectar at the flowers of tall trees, epiphytes, shrubs, and Heliconia plants. Several may feed in one tree and are aggressive to each other, but they are otherwise seldom territorial. Both sexes hawk small insects, mostly by hovering, darting, or sallying from perches.
The white-necked jacobin breeds in the dry to early wet seasons, which vary across their range. The nest is a shallow cup of plant down and cobweb placed on the upper surface of a leaf where another leaf provides a "roof". It is typically 1 to 3 m (3 to 10 ft) above ground and sometimes near a stream. Males display and chase in the canopy and along edges during the breeding season. Females use a fluttering flight to distract predators.
23-3-2017 SAN GERARDO DE DOTA COSTA RICA - THOAS SWALLOWTAIL BUTTERFLY (Papilio thoas)
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Papilio thoas, the king swallowtail or Thoas swallowtail, is a butterfly of the family Papilionidae. It is found in the southernmost United States, Mexico, Central America and South America (as far south as Argentina and Uruguay). The species is easily confused with the giant swallowtail, which it closely resembles in both larval and adult stages. The caterpillars feed on the leaves of citrus plants (Rutaceae). They have also been reported as feeding on a member of the genus Piper.
A large species (12 to 14 cm (4.7 to 5.5 in) wingspan. The wings are narrow. The forewings are mostly brown. A yellow band runs from the tip, becoming narrower towards the back. There is also a row of yellow arcuate spots on the underside of the wing edge. The hind wings are predominantly brown, toothed and have a long caudal process. This carries a yellow core. There is a row of yellow arcuate spots at the edge of the hind wings. A broad yellow band runs through the first half of the wing. Inside sits a black eyespot with blue-white dusting. The yellow regions are more pronounced on the undersides of the wings. Blue-white arcuate spots adjoin the yellow arcuate spots on the upper side. The eyespot is only weakly pronounced. The body of the king swallowtail is yellow.- Seitz "- P. thoas. The spatulate tail has a yellow spot in the middle. The species occurs from Texas and the West Indian Islands southwards to Buenos Aires, but is wanting on the Lesser Antilles. It. is everywhere common and flies in the open country, in gardens and plantations. thoas is a very bold flier, which often mounts high in the air.. The larva lives on Piperaceae and Citrus. — melonius R. & J. is the subspecies from Jamaica: it has no cell-spot on the upper surface of the forewing.
Adult Thoas swallowtails fly year round in the tropics, feeding on nectar of a variety of flowers, including Lantana, Stachytarpheta, and Bougainvillea among other species.
Saturday, 22 April 2017
26-3-2017 RANCHO NATURALISTA, COSTA RICA - VARIEGATED SQUIRREL (Sciurus variegatoides)
The variegated squirrel (Sciurus variegatoides ) is a tree squirrel in the genus Sciurus found in Costa Rica, El Salvador, Guatemala, Honduras, southern Mexico, Nicaragua, and Panama. Fifteen subspecies are recognised. It is a common squirrel and the International Union for Conservation of Nature has rated it a "least-concern species". Variegated squirrels kept as pets in Germany have been implicated in the transmission of a bornavirus to humans from which three people have died.
Variegated squirrels are medium-sized tree squirrels. The are several subspecies recognised which differ in appearance. There is even often a considerable variation between the appearances of individuals in the same population. The dorsal colouration varies between dark brown to yellowish grey. The neck tends to be darker than other parts and there is often a paler patch behind the ears. The underparts are usually some shade of cinnamon. The tail is long and densely bushy; in Mexico it is black, sometimes with white tips to the hairs giving it a frosted appearance. In Nicaragua and Costa Rica, some individuals have pale underparts and tails.
Variegated squirrels are native to Central America. Their range extends from Mexico southwards through Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica and Panama. Habitats in which these squirrels occur include both dry deciduous forest and evergreen forest, secondary growth, and plantations.
Variegated squirrels are solitary and diurnal animals. They seldom descend to the ground and spend the night in a nest. Sometimes they build nests in a hole in a tree but more often construct them of leaves and build in the fork of a branch close to the trunk. These squirrels don't hibernate and spend most of their time in the trees. They are very agile and leap from one branch to another with ease. When threatened Variegated squirrels make chucking sounds and sometimes produce harsh chatter.
Variegated squirrels are herbivores (granivores, frugivores). They primarily are seed-eaters, but also consume fruits, some insects and nestlings. They try to avoid hard shelled seeds but do consume acorns.
Little information is known about the mating habits in Variegated squirrels. The breeding season occurs in April-May. Females build nests high up in the trees where they give birth to 2-8 kittens. The gestation period lasts around 33-46 days. Young are born blind and naked. Fur starts growing after 2 weeks and in 30-32 days kittens open their eyes. Young stay in the nest within 6 weeks and become weaned at 10 weeks after birth. They are independent after 15 weeks and reach reproductive maturity between 12 and 15 weeks of age.
26-3-2017 RANCHO NATURALISTA - PASSERINI'S TANAGER (Ramphocelus passerinii)
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The scarlet-rumped tanager (Ramphocelus passerinii ) is a medium-sized passerine bird. This tanager is a resident breeder in the Caribbean lowlands from southern Mexico to western Panama. This species was formerly known as the scarlet-rumped tanager, but was renamed when the distinctive form found on the Pacific coast of Costa Rica and Panama was reclassified as a separate species, the Cherrie's tanager, Ramphocelus costaricensis. While most authorities have accepted this split, there are notable exceptions (e.g. the Howard and Moore checklist). It was renamed back to the scarlet-rumped tanager in 2018 when Cherrie's Tanager was lumped back into the species.
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This species was named for Carlo Passerini, a professor at the Museum of Zoology of the University of Florence.
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The adult Passerini's tanager is 16 cm long and weighs 31 g. The adult male is mainly black except for a scarlet rump, silvery bill and dark red iris. The female has a grey head, olive upperparts becoming brighter and paler on the rump, brownish wings and tail and ochre underparts. The female's plumage is the one that differs most from Cherrie's tanager. Immatures have an orange tint to the underparts and rump, and look like a paler and duller female Cherrie's tanager.
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The Passerini's tanager's call is a sharp wac. Its song consists of a few clear pleasant notes, delivered in shorter phrases than that of its Pacific relative.
It is very common from sea level to 1200 m altitude, and occurs occasionally up to 1700 m. The preferred habitat is semi-open areas including light second growth, woodland edges, gardens and pasture with bushes.
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Passerini's tanagers occur in pairs, small groups, or as part of a mixed-species feeding flock, and up to a dozen birds may roost together in dense thickets at night. This species feeds on certain small fruit, usually swallowed whole, insects and spiders.
The cup nest is built up to 6 m high in a tree. The normal clutch is two pale blue or grey eggs, marked with black, brown or lilac. This species will sometimes raise two broods in a season.
26-3-2017 RANCHO NATURALISTA - PALM TANAGER (Thraupis palmarum)
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The palm tanager (Thraupis palmarum ) is a medium-sized passerine bird. This tanager is a resident breeder from Nicaragua south to Bolivia, Paraguay and southern Brazil. It also breeds on Trinidad and, since 1962, on Tobago. In Trinidad and Tobago, it is known by colloquial names such as the "palmiste" on American Spanish countries (Colombian pronn: "pūlmist "), Brazil Pipira-verde (Portuguese pronn: "pəəpəərā-værd ") and the "green jean" in American English.
Adult palm tanagers are 19 cm (7.5 in) long and weigh 36 g (1.3 oz). They are grey to dull olive-green. The flight feathers are blackish, and the long tail is blackish edged with green. A yellow wingbar shows in flight. Sexes are similar, although females may be somewhat paler.
It occurs in semi-open areas including cultivation and gardens. The bulky cup nest is built in a tree, usually a palm, or under the eaves of a house, and the female incubates three, sometimes two, brown-blotched cream eggs for 14 days, with another 17 days to fledging.
Palm tanagers are social, restless but unwary birds which eat a wide variety of small fruit. They also regularly take some nectar and insects, including caterpillars. The song is fast and squeaky.
Thursday, 20 April 2017
26-3-2017 RANCHO NATURALISTA - CHESTNUT SIDED WARBLER (Setophaga pensylvanica)
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The chestnut-sided warbler (Setophaga pensylvanica ) is a New World warbler. They breed in eastern North America and in southern Canada westwards to the Canadian Prairies. They also breed in the Great Lakes region and in the eastern United States.
Countries
Antigua and Barbuda, Bahamas, Barbados, Cuba, Dominica, Dominican Republic, Guadeloupe, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Canada, United States, Ecuador, Colombia, Venezuela
This species is a moderately-sized New World warbler. Despite having very different plumage, it is thought to be closely related to the widespread yellow warbler.
In the summer, male chestnut-sided warblers are unmistakable in appearance. They display dark-streaked gray backs, white faces, black eyestripes and yellow crowns. Their underparts are white, with chestnut flanks, and they also have two white wing bars. The adult females resemble washed-out versions of the summer male, and in particular, the females lack the strong head pattern, and also have little to no chestnut coloring on their flanks.
26-3-2017 CATIE CENTER, COSTA RICA - TURKEY VULTURE (Cathartes aura)
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The turkey vulture, known scientifically as Cathartes aura, is a bird of prey that is the most widespread of the New World vultures. It is a large bird, with a wingspan of 160–183 cm (63–72 in), a length of 62–81 cm (24–32 in), and weight ranging from 0.8 to 2.41 kg (1.8 to 5.3 lb). The adult turkey vulture is recognized by its bald red head, dark plumage, and a relatively short, hooked, ivory-colored beak. The underwing coverts are silvery-gray, providing a contrast against the darker wing linings.
When observing the turkey vulture in flight, look for its distinctive silhouette with wings held in a shallow V-shape. The bird often rocks or tips from side to side, allowing the silvery-gray flight feathers to catch the light. The small, red head is proportionally small compared to its body, and the beak is short and hooked. The legs and feet are pinkish in color, often stained white due to urohidrosis, a cooling behavior where the bird defecates on its own legs.
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Turkey vultures inhabit a variety of open and semi-open areas, including subtropical forests, shrublands, pastures, and deserts. They are often found in areas that juxtapose with woodlands, which are important for nesting and roosting.
The turkey vulture's range extends from southern Canada to the southernmost tip of South America. It is a permanent resident in the southern United States, with northern populations migrating as far south as South America.
Turkey vultures are gregarious and roost in large community groups. They are known for their soaring flight, utilizing thermals to stay aloft with minimal flapping. On the ground, they have an ungainly, hopping walk and require significant effort to take flight. They are also known for their horaltic pose, where they spread their wings to dry, warm their body, or bake off bacteria.
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Lacking a syrinx, the turkey vulture's vocalizations are limited to grunts or low hisses.
Breeding season varies with latitude, starting in March in the southern United States and extending into August in northerly latitudes. Turkey vultures nest in protected locations such as cliffs, caves, or hollow trees, laying one to three cream-colored eggs with brown or lavender spots. Both parents incubate and care for the altricial chicks by regurgitating food.
The black vulture is similar in appearance but can be distinguished by its shorter tail and wings, which make it appear smaller in flight.
Turkey vultures feed almost exclusively on carrion, preferring recently dead animals and avoiding putrefied remains. They have a keen sense of smell and can detect the gases produced by decaying animals, which aids in locating food.
The turkey vulture is classified as Least Concern by the IUCN Red List. Populations appear stable, and it has not reached the threshold for inclusion as a threatened species.
26-3-2017 CATIE CENTER, COSTA RICA - PURPLE GALINULE (Porphyrio martinica)
The purple gallinule (Porphyrio martinicus) is a swamphen in the genus Porphyrio. It is in the order Gruiformes, meaning "crane-like", an order which also contains cranes, rails, and crakes. The purple gallinule is a rail species, placing it into the family Rallidae. It is also known locally as the yellow-legged gallinule. The specific name martinica denotes "of Martinique".
These birds are found in the southeastern states of the United States during the breeding season. They are resident species in southern Florida, the Gulf and Pacific coast of Mexico, parts of Central America, and the Caribbean. During the non-breeding season, they are found more inland in parts of Central America. They can also be found within South America during migration, and sometimes strays can be found as far north as Canada. The species' habitat is freshwater marsh with dense stands of vegetation.
The species has the greatest pattern of vagrancy amongst rails, with individuals recorded as far west as California and the Galápagos Islands, as far north as Iceland and Labrador, as far south as Tierra del Fuego, and as far east as Great Britain, Portugal and Cape Verde.
The courtship of purple gallinules occurs while they are standing and can be displayed by both sexes. Courtship occurs when the birds of a pair have been separated and then wander close to one another. They then perform the principal display, which is performed by both sexes at the same time. The display entails the bird standing in a slightly bent forward position, with the neck outstretched. The wings are held at an almost right angle to the body and bent at the wrist, so that the primaries are angled down. Following the principal display, one or both of the birds will strut and cut across the path of the other with half-lowered wings, or they will make a deep bow as they approach each other.
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