Grizzled giant squirrel
| Grizzled giant squirrel | |
|---|---|
| File:Flickr - Rainbirder - Giant Squirrel (Ratufa macroura).jpg | |
| The highland subspecies of Giant Squirrel, with denser fur. | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | |
| Family: | |
| Genus: | |
| Species: |
R. macroura
|
| Binomial name | |
| Ratufa macroura (Pennant, 1769)
|
|
| Subspecies[2] | |
|
|
 |
|
| Grizzled giant squirrel range | |
| Synonyms | |
|
Ratufa macroura Phillips, 1931 subspecies sinhala |
|
Lua error in Module:Taxonbar/candidate at line 22: attempt to index field 'wikibase' (a nil value).
The grizzled giant squirrel (Ratufa macroura) is a large tree squirrel in the genus Ratufa found in the highlands of the Central and Uva provinces of Sri Lanka, and in patches of riparian forest along the Kaveri River and in the hill forests in the Tamil Nadu and Kerala states of southern India.[3] The International Union for Conservation of Nature (IUCN) lists the species as near threatened due to habitat loss and hunting.
It is the national animal of Sri Lanka.
There are three subspecies, all of which are found in Sri Lanka. The subspecies R. m. dandolena (taken from the Sinhalese language name for the Grizzled giant squirrel, dhandu laena-දඩු ලේනා) is also found in India.
Grizzled Squirrel Wildlife Sanctuary is located in Shenbagathoppu, Srivilliputtur, Tamil Nadu, India.
Contents
Etymology
Grizzled Giant Squirrels are named for the white flecks of hair that cover their greyish-brown bodies, giving them a grizzled look.[4]
Description
R. macroura is the smallest of the giant squirrels found in the Indian subcontinent, with a head and body length of 25 to 45 centimetres (9.8 to 17.7 in), and tail measuring roughly the same or more, for a total length of 50 to 90 centimetres (20 to 35 in). It has small rounded ears with pointed tufts. The home range of an individual is between 1,970 and 6,110 square metres.
Subspecies dandolena is dorsally brown grizzled with white. Ventrally light brownish cream. Tail frosted with white fur. Forehead and feet are black in color. Whereas ssp. melamochra, upper parts are jet black which contrast brownish cream to orange yellow ventral surface. Tail frosted with black fur. Snout of both ssp. are pinkish color.
Hands are normal pentadactylilty, with four digits and a rudimentary thumb. Fingers have large broad soft pads, where inner pad is expanded for gripping while moving through branches. Feet are also comprised with soft pads and both fore and hind limbs possessing long, sharp claws. .[5]
Distribution
In India, R.macroura has been recorded from Grizzled Squirrel Wildlife Sanctuary, Theni Forest Division, Palni Hills, Chinnar Wildlife Sanctuary, Anaimalai Tiger reserve, Sirumalai, Thiruvannamalai Forest Division of the Eastern Ghats, Hosur Forest Division and Cauvery Wildlife Sanctuary.[6]
In Sri Lanka, it is recorded from all parts of dry zone, specially in Anuradhapura, Mihintale, Kandalama, Matale, Wasgamuwa, and Central Hills and Uva Province.
Diet
Ratufa macroura are known to take fruits, nuts, insects, bird eggs, and the bark of some trees. The fruit of the climber Combretum ovalifolium is an especially important food source where it occurs. Young squirrels, upon first emerging from the nest, have been observed to feed exclusively on this fruit.[7]
Ecology
Almost entirely arboreal mammal, very rarely come to the ground to escape from predators, to flee from an intruder, attack males of the territory, and connecting with females. The sight is efficient, which enables them to protect against many predators. Sense of hearing is relatively poor.[5]
Unlike its relatives, giant squirrel gets balance through its two hind feet, instead of tail.
Communication
Call is staccato and loud with repeated shrill cackle. It is usually uttered in morning and evening. A low "churr" is also used to communicate with nearby groups.
A young / baby of a Sri Lankan giant squirrel is called a 'pup, kit or kitten'. The females are called 'doe' and males 'buck'. A Sri Lankan giant squirrel group is called a 'dray or scurry'.[8]
Subspecies
The three subspecies are easily recognizable due to color distinctions. They are also geographically separated demes. The table below lists the three recognized subspecies of Ratufa macroura, along with any synonyms associated with each subspecies:[2]
| Subspecies | Authority | Synonyms |
|---|---|---|
| R. m. macroura | Pennant (1769) | albipes, ceilonensis, ceylonica, macrura, montana, tennentii |
| R. m. dandolena | Thomas and Wroughton (1915) | sinhala |
| R. m. melanochra | Thomas and Wroughton (1915) | none |
According to Mammals of Sri Lanka, the three subspecies are identified as follows:
- Ratufa macroura macroura
Males are 35 cm long and females with 37 cm. Tail is 37 cm long in males and 38 cm in females. Jet black dorsal area with a sheen. Rump with white grizzling appearance. Underparts brownish creamy to pale yellow. Tail is with dark black fur with white tip. Face has pinky color in naked areas. Fur moderately long with few coarse hairs. Geographically, this subspecies is restricted to central highlands up to 2000m, such as Horton Plains.
- Ratufa macroura dandolena
Males are 37 cm long and females 35 cm. Tail varies from 37 cm in males and 40 cm in females. Males are larger than females. Dorsal surface is brown instead of jet black in subsp. macroura. White rump. Distinct maroon tinge between shoulders. There is a brownish cream crown patch. Underparts are light brownish cream. Tail is dark brown and there is a reddish brown tip. Fleshy parts of face are pink. Fur moderately long and coarse. Inhabit in dry zone parts of the island, as well as India.
- Ratufa macroura melanochra
Males are 35 cm long and females 37 cm. Tail varies from 37 cm in males and 38 cm in females. Upperparts are jet black with contrasting color variation with creamy yellowish ventral surface. Fur is shorter and coarser. Found in low country wet zone, and intermediate zones of the country.
References
- ↑ Joshua, J., de A. Goonatilake, W. I. L. D. P. T. S. & Molur, S. (2008). Ratufa macroura. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 6 January 2009.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://animaladay.blogspot.com/2012/09/grizzled-giant-squirrel.html
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://thewebsiteofeverything.com/animals/mammals/Rodentia/Sciuridae/Ratufa/Ratufa-macroura.html
External links
 |
Wikimedia Commons has media related to Ratufa macroura. |
- ARKive - images and movies of the grizzled giant squirrel (Ratufa macroura)
- Lua error in package.lua at line 80: module 'strict' not found.
- Animal Diversity Web
.jpg){kind=link}
.jpg){kind=link}