Ramphastos toco

Geographic Range

Toco toucans ( Ramphastos toco ) thrive over a wide range of habitats and locations throughout much of the Neotropical region. They are native to the countries of Argentina, Peru, French Guiana, Bolivia, Paraguay, Suriname, and Brazil. Studies have shown a correlation between the wide range of R. toco and the availability of fleshy fruits, which make up the majority of the toucan's diet.

• Biogeographic Regions
• neotropical neotropical
  • native native

Habitat

Toco toucans are most commonly found in dry semi-open areas, which include regions such as woodland, savanna, plantations, and other regions that consist of scattered trees. In Brazil, toco toucans have been found in abundance in the "cerrado." Brazil's cerrado consists of savanna, semidecidious, and gallery forests surrounding river corridors. They are canopy frugivores that rely heavily on the availability of seasonal fruiting plants. Toco toucans therefore move from one habitat and region to the next in order to satisfy their dietary needs. This species is typically found at lowland elevations. However they have been sighted in elevations up to 1750 m around the Andes mountain range of South America.

• Habitat Regions
• tropical tropical
• terrestrial terrestrial

• Terrestrial Biomes
• savanna or grassland savanna or grassland
• forest forest
• scrub forest scrub forest

• Other Habitat Features
• riparian riparian

Physical Description

Toco toucans are recognized as the largest species in the toucan family and flaunt the biggest beak in regard to body size of all birds. This large yellow-orange colored beak with a distinct black marking at the tip of the bill is the most noticeable feature of R. toco . It accounts for one-twentieth of the total mass of the toucan, while also contributing to one-third of the bird's total length. Toco toucans weigh between 592 and 760 g, and average 61 cm in length. This species has what appears to be a blue iris, but is in fact a thin layer of skin that surrounds the eye. The blue circle is encompassed by an additional ring of orange skin that adds to the colorful physical appearance of toco toucans. Its basal metabolic rate is estimated at 8.72 cubed cm of oxygen per hour. Sexual dimorphism is present in this species of toucan. Measurements and observations reveal physical differences between males and females. Adult male toco toucans are typically larger than adult females. Juveniles are easily differentiated from the adults due to the young's duller colors and stubbier bill.

• Other Physical Features
• endothermic endothermic
• homoiothermic
• bilateral symmetry bilateral symmetry

• Sexual Dimorphism
• male larger

Reproduction

The large colorful bills of toco toucans are often thought to be used in mate choice, but there are no specific studies that lead to this conclusion. However, it is known that this species uses its bill to gather fruit that is used in the bird's mating ritual. This courtship ritual consists of either the male or female initiating a fruit toss with its potential mate. After this ritual has been carried out, the male mates with the female.

• Mating System
• monogamous monogamous

The breeding season for toco toucans occurs in the spring. Tree cavities are the typical nesting site where a single clutch of 2 to 4 eggs are laid by the female. Toco toucans breed yearly and have altricial young. The hatchlings are bare-skinned, close-eyed, and helpless until approximately 6 to 8 weeks later. At this time, the young begin to develop their characteristic beak and will soon fledge. Toco toucans become sexually mature in 3 to 4 years.

• Key Reproductive Features
• iteroparous iteroparous
• seasonal breeding seasonal breeding
• gonochoric/gonochoristic/dioecious (sexes separate)
• sexual sexual
• oviparous oviparous

Both parents take turns incubating the eggs in the small cavity of a tree where the nest is situated. Nests of this species were found to be lined with regurgitated manduvi seeds from the manduvi tree ( Sterculia apetala ), suggesting that parents may provision nestlings with this fruit. The young remain in the nest for about 6 to 8 weeks.

• Parental Investment
• altricial altricial
• male parental care male parental care
• female parental care female parental care
• pre-fertilization
  • provisioning
  • protecting
    • female
• pre-hatching/birth
  • provisioning
    • male
    • female
  • protecting
    • male
    • female
• pre-weaning/fledging
  • provisioning
    • male
    • female
  • protecting
    • male
    • female
• pre-independence
  • provisioning
    • male
    • female
  • protecting
    • male
    • female

Lifespan/Longevity

A lifespan of 20 years is typically seen in wild toco toucans with a maximum recorded lifespan of 26 years. In captivity, this species of toucan often has a shorter lifespan of approximately 18 years. Toco toucans that have been raised in captivity often experience iron-storage disease, which is sometimes referred to as hemochromatosis. This disease can lead to an uncomfortable life of the toucan involving emaciation, dyspnea, and feather picking and may eventually lead to the death of the bird. Since the diet of toco toucans is primarily fruits, which involves a low intake of iron, they have seemed to develop very iron-absorbent organs. When a toxic amount of iron builds-up within the liver of the bird due to the high-iron diet that many of these captive toucans are fed, the iron-storage disease occurs.

Behavior

Toco toucans are very social birds and live in flocks of approximately six members. This species is very mobile due to the constant change of available fruits in regions of their geographic range. Although the bright colors of their beak successfully camouflage this species in the forest's canopy, their noisy vocalizations seem to defeat the purpose of their camouflage.

• Key Behaviors
• arboreal arboreal
• flies
• diurnal diurnal
• motile motile
• nomadic nomadic
• social social

Home Range

Toco toucans have a very wide home range due to their frugivorous diet and the availability and abundance of seasonal fruits. Exact territory size is unknown.

Communication and Perception

Toco toucans are very loud communicators with various means of sound production. Their repertoire consists of deep, course croaking that is repeated on a consistent basis. A rattling call is also a common form of conversation in this species. Besides vocal communication, they use bill-clacking as a form of auditory communication. Like all birds, toco toucans perceive their environment through visual, auditory, tactile, and chemical stimuli.

• Communication Channels
• visual visual
• acoustic acoustic

• Perception Channels
• visual visual
• tactile tactile
• acoustic acoustic
• chemical chemical

Food Habits

Toco toucans are canopy frugivores whose diet is composed mainly of fruits, but they are considered to be an opportunistic feeder. They also occasionally feed on various types of insects and eggs of other birds, including those of endangered hyacinth macaws ( Anodorhynchus hyacinthinus ). Their broad geographical range of habitats is due in part to their foraging behavior and their diet of briefly-available fruits. The food sources include the fruits from trees such as genipapo ( Genipa americana ), agarrapolo ( Ficus luschnathiana ), ambay pumpwood ( Cecropia pachystachya ).

The large bills of toco toucans are the main foraging tool that allows the birds to reach into tree holes and to grasp fruits from surrounding branches. Toco toucans are unique in that they does not use their tongue in the process of swallowing food. Instead, they place a piece of fruit between the very end of their beak and lean their head back at an approximately 180 degree angle. This causes the food item to project directly into the pharynx.

• Primary Diet
• herbivore herbivore
  • frugivore frugivore

• Animal Foods
• amphibians
• reptiles
• eggs
• insects

• Plant Foods
• seeds, grains, and nuts
• fruit

Predation

Although the colorful characteristics of toco toucans provide adequate camouflage in the forest canopy, common predators include jaguars ( Panthera onca ), snakes (order Serpentes ), coatis ( Nasua and Nasuella species), and eagles ( Accipitridae ).

• Anti-predator Adaptations
• cryptic cryptic

Ecosystem Roles

Even though toco toucans prey on the eggs of endangered hyacinth macaws ( Anodorhynchus hyacinthinus ), these macaws are in fact indirectly dependent on the toucans. Since hyacinth macaws almost always nest in the hollows of the manduvi tree and the manduvi tree depends upon the seed dispersal services provided by toco toucans, hyacinth macaws are indirectly dependent on this species of toucan.

• Ecosystem Impact
• disperses seeds

Economic Importance for Humans: Positive

Because of the natural attraction to the colorful and odd bills of toco toucans, tour guides in many South American countries provide trips to see them in their natural habitat. Also, many zoos attempt to preserve the natural beauty of this bird in a safe and people-friendly environment. Toco toucans are also found in the pet trade.

• Positive Impacts
• pet trade pet trade
• ecotourism ecotourism

Economic Importance for Humans: Negative

There are no known adverse effects of toco toucans on humans.

Conservation Status

Toco toucans are considered by the IUCN Red List of Threatened Species to be of "least concern." This is due to the broad range and fairly common status of this species in its designated habitats and biogeographic range. They are listed under appendix II of CITES which regulates the trade of this species.

Additional Links

Encyclopedia of Life

Contributors

Shannon Behmke (author), Florida State University, Emily DuVal (editor), Florida State University.

References

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Bird Paradise, World's Largest Birdstore, 2009. "Toucans/Toucanets" (On-line). Accessed February 11, 2010 at http://bird-paradise.biz/Toucan_ets.htm .

BirdLife International, 2009. "IUCN red list of threatened species" (On-line). Accessed February 11, 2010 at http://www.iucnredlist.org/apps/redlist/details/141926/0 .

Castro, M., S. Recco-Pimentel, G. Rocha. 2003. Sexual dimorphism in Ramphastos toco and Ramphostos dicolorus (Piciformes, Aves). Revista de Biologia Tropical , 51: 241-245.

Drews, A., S. Redrobe, J. Patterson-Kane. 2004. Successful reduction of hepatocellular hemosiderin content by dietary modification in toco toucans ( Ramphastos toco ) with iron-storage disease. Journal of Avian Medicine and Surgery , 18: 101-105.

McNab, B. 2009. Ecological factors affect the level and scaling of avian BMR. Comparative Biochemisty and Physiology , 152: 22-45.

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Pizo, M., C. Donatti, N. Guedes, M. Galetti. 2008. Conservation puzzle: Endangered hyacinth macaw depeds on its nest predator for reproduction. Biological Coservation , 141: 792-796.

Ragusa-Netto, J. 2006. Abundance and frugivory of the toco toucan ( Ramphastos toco ) in a gallery forset in Brazil's Southern Pantanal. Brazilian Journal of Biology , 66: 133-142.

Ragusa-Netto, J. 2008. Toco toucan feeding ecology and local abundance in a habitat mosaic in the Brazilian cerrado. Ornithologia Neotropical , 19: 345-359.

Seki, Y., M. Schneider, M. Meyers. 2005. Structure and mechanical behavior of a toucan beak. Acta Materialia , 53: 5281-5296.

Tattersall, G., D. Andrade, A. Abe. 2009. Heat exchange from the toucan bill reveals a controllable cascular thermal radiator. Science , 325: 468-470.

UNEP-WCMC, 2009. "

UNEP-WCMC species database: CITES-listed species

Zoological Society of San Diego, 2010. "Toco Toucan" (On-line). Accessed February 12, 2010 at http://www.sandiegozoo.org/animalbytes/t-toucan.html .