573.

Day’s Grass Mouse

Akodon dayi

French: Akodon de Day / German: Day-Graslandmaus / Spanish: Raton campestre de Day

Other common names: Dusky Akodont

Taxonomy. Akodon day: Osgood, 1916, “Todos Santos, Chaparé River [Cochabamba], Bolivia.”

Akodon dayi 1s poorly known and probably includes more than one form. Monotypic.

Distribution. NW, C & NE Bolivia.

Descriptive notes. Head-body 110-134 mm, tail 75-84 mm, hindfoot 25-27 mm (ranges from the original series); ear 16-19 mm and weight 26-41 g. Day’s Grass Mouse is a medium-sized species of Akodon . Dorsum is blackish brown,sides are slightly paler, and venteris rufous. Ears are blackish; forefeet and hindfeet are brownish black above; and tail is blackish.

Habitat. Mesic areas including savannas, lowland dry forests, and moist forests of Amazonia, Chiquitano, Campos Cerrados, and Yungas ecoregions at elevations of 250-2450 m.

Food and Feeding. No information.

Breeding. Five pregnant Day’s Grass Mice had 2-5 embryos (mean three), with pregnancies recorded in March and June-July. Juveniles were collected in March.

Activity patterns. No information.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Least Concern on The IUCN Red List.

Bibliography. Anderson (1997), Anderson & Olds (1989), Dunnum, Vargas & Bernal (2016a), Myers (1990), Osgood (1916), Pardinas, Teta, Alvarado-Serrano et al. (2015), Vargas & Gonzales (2005).