Baby Common Rat/Mouse (Pinky)

Scientific Name: Rattus norvegicus (if rat) or Mus musculus (if mouse)

Order & Family: Order: Rodentia, Family: Muridae

Size: Newborns are approximately 1-1.5 inches (2.5-4 cm) in length, excluding the tail.

Natural Habitat

Found nearly everywhere humans live, including urban areas, basements, walls, and fields. Nests are built in secluded, warm areas.

Diet & Feeding

Omnivorous (grains, seeds, fruits, meats, and food scraps), but as newborns, they rely entirely on their mother's milk.

Behavior Patterns

Newborns (pups) are altricial: born hairless, blind, and deaf. They are completely dependent on the mother for warmth and nutrition. They begin to grow fur after a few days and open their eyes after about two weeks.

Risks & Benefits

Risks: Can carry numerous diseases (hantavirus, leptospirosis, salmonella), contaminate food supplies, and cause structural damage by gnawing. Benefits: Play a role in food webs as prey for birds, snakes, and other predators; laboratory mice/rats are crucial for scientific research.

Identified on: 3/6/2026