113367 Black Rat Rattus rattus Length 30-45cm Nocturnal, omnivorous rodent. Recalls Brown Rat but has sleeker body outline and darker coat. Adult has mainly blackish fur, palest on underparts. Coat looks shaggy due to bristle-like guard hairs. Ears are rather large and tail is relatively long. Squeals in distress. Introduced to Britain; formerly abundant, now scarce and declining. Seldom ventures below ground, have an aversion to water and prefers warmer, drier situations overall.