Males of the Amami spiny rat (Tokudaia osimensis) are not like most therian mammals -- a name used to group animals that give live birth including placental mammals and marsupials.

T. osimensis stem cells, originally derived from female rat cells, were found in both male and female rat-mouse chimeras. HONDA ET AL., SCI ADV, 3:E1602179, 2017 In most mammals, females have two X ...

The Spiny Boki Mekot Rat was found in the mountain forests of Halmahera, in the Moluccas (Maluku) archipelago. It was from these islands that Alfred Russel Wallace wrote to Charles Darwin ...

A prominent tuft of spiny hair on the back, a white tail tip and three pairs of teats represent the unique set of characteristics describing a new genus of rat which has been discovered in the ...

This is a very fuzzy, cute rodent, and no one has seen one like it since 1898. It's called a red-crested tree rat, or, more evocatively, a red-crested soft-furred spiny-rat. This one wandered up ...

In the Amami spiny rat, the the Sry gene is completely absent; thus, it has evolved a novel, unknown sex-determining mechanism independent of Sry.

Tome’s spiny rat also grows spikes and runs around South America using them. And they both are most active at night. And they can both grow up to a pound and a half.

Unlike the rats and mice commonly used in laboratory research, spiny mice evolved to live in the wild in large, mixed-sex groups -- they even allow unrelated newcomers to join their groups.

Tufts of harsh, bristly hair and a white tail tip are among the defining features of a new rodent species discovered in Indonesia. The Spiny Boki Mekot Rat was found in the mountain forests of ...