What does a five-month-old rat look like? - briefly
At five months the rat reaches adult dimensions—approximately 8–10 cm (3–4 in) body length, a 5–6 cm (2–2.5 in) tail, and 300–400 g weight. Its coat is fully mature, smooth, and displays the typical coloration of the species.
What does a five-month-old rat look like? - in detail
A rat that is five months old has reached full adult size but may still display subtle signs of ongoing growth. Typical adult laboratory or fancy pet rats weigh between 250 g and 350 g, with males generally heavier than females by 20–30 g. Body length, measured from nose to the base of the tail, ranges from 18 cm to 22 cm. The tail adds an additional 15 cm to 20 cm, often slightly longer than the body, and is covered with fine, slightly scaly hair.
Fur at this stage is fully developed, dense, and exhibits the coat pattern selected by breeding. Common colors include black, brown, agouti, white, and various spotted or patched combinations. The hair on the dorsal surface lies flat and smooth, while the ventral fur is softer and lighter in shade. Whiskers are long, stiff, and extend well beyond the snout, providing tactile feedback.
Facial features are mature: eyes are fully pigmented, bright, and proportionally large, offering a wide field of vision. Ears are upright, rounded, and covered with a thin layer of fur; they can rotate independently to detect sound direction. The nose is moist and black, with a well‑defined, slightly upturned tip.
Limbs are robust and proportionate to the body. Front paws contain five digits, each ending in a small, curved claw; hind paws have four digits with similar claws. Muscles are well‑toned, enabling swift, agile movement and the ability to climb or squeeze through narrow openings. The tail, while flexible, is not prehensile; it serves primarily for balance and thermoregulation.
Sexual dimorphism becomes apparent:
- Males develop a larger, more pronounced anogenital distance and a visible scrotal sac when mature.
- Females possess a smaller, rounded abdomen and a distinct vulvar opening.
Overall, a five‑month‑old rat appears as a compact, fully furred mammal with adult proportions, a long hair‑covered tail, and clear gender markers, ready for breeding or continued observation.