Aegialomys galapagoensis

The Galapagos rice rat is a medium-sized rodent, with a head-body length of {{convert|20|to|35|cm}}, and a tail {{convert|14|to|17|cm}} long. It has very long, soft and dense fur that is grizzled copper-brown above and yellowish-grey on the underparts. The ears are long and covered with dense hair, and the feet have large pads on the soles, with claws up to {{convert|2.5|mm|sigfig=1}} in length, suggesting that it has little, if any, climbing ability.{{cite journal |last1= Prado |first1= J.R. |last2= Percequillo |first2= A.R. |date= October 2019 |title= Aegialomys galapagoensis (Rodentia: Cricetidae) |journal= Mammalian Species |volume= 51 |issue= 981 |pages= 92–99 |doi= 10.1093/mspecies/sez013|doi-access= free }}

The Galapagos rice rat is found only in the eastern Galapagos. Today, it occurs only on Santa Fé Island, and possibly on Santiago Island.{{cite journal |last1= do Prado |first1= J.R. |last2= Percequillo |first2= A.R. |date= January 2017 |title= Systematic studies of the genus Aegialomys Weksler et al., 2006 (Rodentia: Cricetidae: Sigmodontinae): geographic variation, species delimitation, and biogeography |journal= Journal of Mammalian Evolution |volume= 25 |pages= 71–118 |doi= 10.1007/s10914-016-9360-y|s2cid= 3277614 }} A separate population formerly existed on San Cristóbal Island, and is considered to represent a separate subspecies, but is thought to have been extinct for many decades.{{cite journal |last1= Dowler |first1= R.C. |last2= Carroll |first2= D.S. |last3= Edwards |first3= C.W. |date= April 2009 |title= Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands |journal= Oryx |volume= 34 |issue= 2 |pages= 109–117 |doi= 10.1046/j.1365-3008.2000.00104.x|doi-access= free }} Its natural habitat is subtropical or tropical dry shrubland.

The Galapagos rice rat is primarily nocturnal, but may sometimes be active before sunset, spending the day resting in crevices beneath lava blocks or under shrubs. It is omnivorous, feeding on plant matter and insects. Like many of the animals of the Galápagos, it is tame and unafraid of humans. Scientists working on Santa Fé Island and Fernandina Island have reported that it is necessary to keep tents open to prevent these rice rats from chewing in during the night.{{cite book |last= Steadman |first= David W. |author-link= David Steadman |date= 1988 |title= Galápagos: Discovery on Darwin's Islands |location= Washington |publisher= Smithsonian Institution Press |pages= 63–65, 118 |isbn= 0-87474-882-8}} It is also commonly seen on beaches, where it is attracted by fish remains left behind by human activity.

Breeding seems to take place primarily in the hot season with young being born between March and May,{{cite journal |last1= Clark |first1= David B. |date= February 1980 |title= Population ecology of an endemic neotropical island rodent: Oryzomys bauri of Santa Fe Island, Galapagos, Ecuador |journal= Journal of Animal Ecology |volume= 49 |issue= 1 |pages= 185–198 |doi= 10.2307/4283|jstor= 4283 |bibcode= 1980JAnEc..49..185C }} but may occur at other times of year, perhaps depending on the availability of food resources.{{cite journal |last1= Harris |first1= D.B. |last2= Macdonald |first2= D.W. |date= February 2007 |title= Population ecology of the endemic rodent Nesoryzomys swarthi in the tropical desert of the Galápagos Islands |journal= Journal of Mammalogy |volume= 88 |issue= 1 |pages= 208–219 |doi= 10.1644/05-MAMM-A-370R4.1|doi-access= free }} Litters of 2–7 young are born hairless and blind, opening their eyes and developing the adult coat by day 13 after birth. The maximum lifespan in the wild has been recorded as 599 days.

The species was previously placed in Oryzomys as Oryzomys galapagoensis. The subspecies A. g. bauri from Santa Fé Island is sometimes considered to represent a full species. A. g. galapagoensis was formerly found on San Cristóbal Island, where Charles Darwin captured several live specimens on the second voyage of HMS Beagle in 1835. However, it is believed that it became extinct only decades after Darwin's visit, and the next specimens collected were subfossil remains found in lava tubes by David Steadman and colleagues in 1984. Its closest relative is Aegialomys xanthaeolus, the only other species in the genus, which is found in coastal Ecuador and Peru.{{cite journal |last1=Weksler |first1=M. |last2=Percequillo |first2=A. R. |last3=Voss |first3=R. S. |date=2006-10-19 |title=Ten new genera of oryzomyine rodents (Cricetidae: Sigmodontinae) |url=https://ia903207.us.archive.org/6/items/tennewgeneraory00weks/tennewgeneraory00weks.pdf |journal=American Museum Novitates |publisher=American Museum of Natural History |issue=3537 |pages=1–29 |doi=10.1206/0003-0082(2006)3537[1:TNGOOR]2.0.CO;2 |s2cid=84088556 |hdl=2246/5815}}

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Category:Aegialomys

Category:Endemic fauna of the Galápagos Islands

Category:Mammals described in 1839

Category:Taxonomy articles created by Polbot