Tuesday, Oct 21, 2014

Pitohui

Hooded Pitohui

PitohuisThe Pitohui (pronounced like spitting: pittoeey) is one of New Guinea's most widely spread birds.

It is, in fact, the only known genus of poisonous bird in the world. At least three species of pitohui have a strong poison in their skin and feathers, the Hooded and Variable Pitohui being the deadliest of the three.

The skin and feathers of some pitohuis contain powerful neurotoxic alkaloids of the batrachotoxin group (also secreted by the Colombian poison dart frogs, genus Phyllobates). It is believed that these serve the birds as a chemical defense, either against ectoparasites or against visually guided predators such as snakes, raptors or humans. (Dumbacher, et al., 1992)

The birds probably do not produce batrachotoxin themselves. It is most likely that the toxins come from the Choresine genus of beetles, part of the bird's diet. (Dumbacher, et al., 2004)

The poisonous properties of this bird were not recorded until 1989. Jack Dumbacher, who was netting birds in New Guinea, caught a Hooded Pitohui and in untangling it from his net, got scratched and bit. But it was a small bird, and not a big threat, right? Wrong. Dumbacher put a cut finger in his mouth and his lips and tongue went numb. While that was the extent of his reaction, it caused a much more significant one in the scientific community.

Undoubtedly, there are other bird species that have chemical self-defense mechanisms to prevent predators from eating them, but to date, this is the only bird found to actually be poisonous to humans. Can you eat them? Yes! The natives of New Guinea do eat them, but warn they must be prepared very carefully, including skinning. Even gently simmering the skin in water will produce a toxic substance


Species

Currently six species are classified in the genus, though current molecular genetics research suggests that significant reclassification of the Pachycephalidae may be needed.

  • Black Pitohui, Pitohui nigrescens: The Black Pitohui is found in Indonesia and Papua New Guinea.

  • Crested Pitohui, Pitohui cristatus: The Crested Pitohui is found in Indonesia and Papua New Guinea.

  • Hooded Pitohui, Pitohui dichrous: Widespread throughout New Guinea.

  • Rusty Pitohui or Brown Pitohui, Pitohui ferrugineus

  • Variable Pitohui, Pitohui kirhocephalus: The Variable Pitohui is found in Indonesia and Papua New Guinea.

  • White-bellied Pitohui, Pitohui incertus: The White-bellied Pitohui is found in Indonesia and Papua New Guinea.

Description:

Pitohuis are generally about 23 centimetres long with strong legs and a powerful beak. They are brightly feathered in red and black warning colors, much the same as the frogs. The Hooded appears to be the most dangerous, with the Variable being of medium toxicity and the Brown Pitohui the least harmful.  

The Hooded Pitohui is brightly colored, with a brick red belly and a jet black head. The Variable Pitohui, as its name implies, exists in many different forms, and twenty subspecies with different plumage patterns have been named. Two of them, however, closely resemble the Hooded Pitohui.

It has been suggested that the birds' bright colours are an example of aposematism (warning colouration), and the similarity of the Hooded Pitohui and some forms of the Variable Pitohui might then be an example of Müllerian mimicry, in which dangerous species gain a mutual advantage by sharing colouration, so that an encounter with either species trains a predator to avoid both. (Dumbacher and Fleischer, 2001)


Copyright: Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia.org, Dumbacher et al , Smithsonian ...http://nationalzoo.si.edu/Publications/ZooGoer/2001/2/intoxnewguineabirds.cfm



Please Note: The articles or images on this page are the sole property of the authors or photographers. Please contact them directly with respect to any copyright or licensing questions. Thank you.

The Avianweb strives to maintain accurate and up-to-date information; however, mistakes do happen. If you would like to correct or update any of the information, please send us an e-mail. THANK YOU!

More Bird Videos

More Bird Images

©
©
© Eva Martinez
Subscribe to Comments for "Pitohui"