Sir David's long-beaked echidnas are the smallest echidna species, weighing 2 to 3 kilograms. The rostrum is approximately 70 mm long and is somewhat straighter than other echidna species. The short rostrum and their size makes them appear similar to short-beaked echidnas (Tachyglossus aculeatus). They have 5 claws on each foot and adult males have a small non-venomous spur on the inside of each ankle. Adult females lack these spurs. The fur is distinctive, short, fine, and dense, unlike other echidnas, and raw umber brown in color. There is short fur that covers the few spines on the middle back of this species. The spines are almost white and are most dense nearest the tail. Adults have no teeth, but the tongue is covered in teeth-like spikes. Like other Zaglossus species, they have no external genitalia; making sex determination difficult. (Baillie, et al., 2009; Flannery and Groves, 1998; "EDGE: Mammal Species Information", 2009)
Not much is known about the reproductive or mating behaviors of (Baillie, et al., 2009)because only one specimen has been found to date. It is unknown when these animals breed or whether they are promiscuous.
It is thought that the reproductive behavior might be similar to that of other Zaglossus species. The number of offspring during a breeding cycle is unknown, as is the gestation period and the age at which sexual maturity is reached. Most likely, as with other Zaglossus species, when females reach sexual maturity the non-venomous spurs on their ankles usually disappear. (Flannery and Groves, 1998)
It is thought that Sir David's long-beaked echidnas females care for and protect their young after laying the eggs and after their hatching. Young stay in dens. Not much else is known about parental involvement in the species. (Flannery and Groves, 1998)
The lifespan of (Flannery and Groves, 1998)is unknown.
The behavior of Sir David's long-beaked echidnas is not known, other than that they inhabit the Cyclops Mountains and feed on worms and larvae. (Baillie, et al., 2009; Flannery and Groves, 1998; "EDGE: Mammal Species Information", 2009)
The home range of this species is unknown. (Flannery and Groves, 1998)
Sir David's long-beaked echidnas most likely relies on their sense of smell to find worms and larvae to eat. They use their beak to find food. Like other echidnas, they are likely to use electroreception to find food. They have electroreceptors on the tips of their snouts, which they can press to the ground or other objects to detect living organisms and to perceive the environment. (Flannery and Groves, 1998; "Electroreception in fish, amphibians, and monotremes", 2010; "EDGE: Mammal Species Information", 2009)
Forms of social communication are unknown in this species. (Flannery and Groves, 1998)
It is mostly unknown what Sir David's long-beaked echidnas feed on in the wild, but it is thought that they feed on worms. Researchers have identified holes in the ground made by their rostra as they poke for food. (Baillie, et al., 2009; Leary, et al., 2011; "Electroreception in fish, amphibians, and monotremes", 2010; Phillips, et al., 2009)
It is unknown if ("EDGE: Mammal Species Information", 2009)has any natural predators.
Sir David's long-beaked echidnas have cultural importance in the communities surrounding the Cyclops Mountains. Sometimes disputes are resolved by having the two fighting parties share a meal of echidna. At other times, people are punished by either having to pay a fine or by having to find an echidna in the mountains. (Baillie, et al., 2009)
Because the adult males of (Flannery and Groves, 1998)have a spur on each ankle, they can cause some harm to humans by sticking them with the spurs. However, the spurs are not venomous.
The species was thought to be extinct until 2007, when an expedition led by EDGE team members discovered evidence that (Baillie, et al., 2009; Leary, et al., 2011; "EDGE: Mammal Species Information", 2009)still existed. Currently, Sir David’s long-beaked echidnas are critically endangered and there is a conservation effort underway where the original specimen was found. The Cyclops Mountains Strict Nature Reserve was created to protect the habitat of . Currently, it is believed that hunting and loss of habitat due to farming and mining are the main reasons for the threat to their survival.
Stephanie Galarza (author), Yale University, Eric Sargis (editor), Yale University, Rachel Racicot (editor), Yale University, Tanya Dewey (editor), University of Michigan-Ann Arbor.
Living in Australia, New Zealand, Tasmania, New Guinea and associated islands.
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
an animal that mainly eats meat
uses smells or other chemicals to communicate
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
parental care is carried out by females
A substance that provides both nutrients and energy to a living thing.
having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.
An animal that eats mainly insects or spiders.
animals that live only on an island or set of islands.
having the capacity to move from one place to another.
This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.
the area in which the animal is naturally found, the region in which it is endemic.
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
remains in the same area
offspring are all produced in a single group (litter, clutch, etc.), after which the parent usually dies. Semelparous organisms often only live through a single season/year (or other periodic change in conditions) but may live for many seasons. In both cases reproduction occurs as a single investment of energy in offspring, with no future chance for investment in reproduction.
reproduction that includes combining the genetic contribution of two individuals, a male and a female
uses touch to communicate
Living on the ground.
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
uses sight to communicate
The Zoological Society of London. 2009. "EDGE: Mammal Species Information" (On-line). EDGE of Existence: Evolutionarily Distinct & Globally Endangered. Accessed January 27, 2012 at http://www.edgeofexistence.org/.
Map of Life. 2010. "Electroreception in fish, amphibians, and monotremes" (On-line). Map of Life - Convergent Evolution Online. Accessed April 30, 2012 at http://www.mapoflife.org/topics/topic_41_Electroreception-in-fish-amphibians-and-monotremes/.
Baillie, J., S. Turvey, C. Waterman. 2009. Survival of Attenborough's Long-beaked Echidna Zaglossus attenboroughi in New Guinea. Cambridge Journals, 43/1: 146-148.
Flannery, T., C. Groves. 1998. Revision of the Genus Zaglossus (Monotremata, Tachyglossidae), with Description of New Species and Subspecies. Mammalia, 62/3: 367-396.
Leary, T., L. Seri, T. Flannery, D. Wright, S. Hamilton, K. Helgen, R. Singadan, J. Menzies, A. Allison, R. James, K. Aplin, L. Salas, C. Dickman. 2011. "IUCN Red List of Threatened Species" (On-line). Zaglossus attenboroughi. Accessed January 27, 2012 at www.iucnredlist.org.
Phillips, M., T. Bennett, M. Lee. 2009. Molecules, Morphology, and Ecology Indicate a Recent, Amphibious Ancestry for Echidnas. Proceedings of the National Academy of Sciences, 106/40: 17089-17094.