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    Rattus norvegicus
    brown rat (English), common rat (English), isorotta (Finnish), Norway rat (English), pouhawaiki (Maori), rat surmolot (French), Rata de noruega (Dominican Republic), rata noruega (Spanish), ratto di fogna (Italian), ratto grigio (Italian), rotta (Finnish), sewer rat (English), surmolotto (Italian), tikus riul (Indonesia), topo delle fogne (Italian), Wanderratte (German), water rat (English)

    Norway rat in tussock on Campbell Island (Photo: Peter and Judy Morrin Wildlife Photography) - Click for full size Norway rat taking bait on Campbell Island (Photo: Peter and Judy Morrin Wildlife Photography) - Click for full size Dead Norway rat on Campbell Island (Photo: Peter and Judy Morrin Wildlife Photography) - Click for full size Norway rat eating penguin on Campbell Island (Photo: Peter and Judy Morrin Wildlife Photography) - Click for full size

    Rattus rattus is lighter and has a shorter maximum head-body length (excluding tail) than Rattus norvegicus. Its tail is much longer than its head-body length and is uniformly coloured. The Norway rat’s tail is clearly shorter than its head-body length, and it has a pale underside. The upper side of the hind foot of Rattus rattus is usually dark, whereas it is always completely pale in the Norway rat. Droppings left by Rattus rattus are almost half as long (6.8-13.8 mm) as the Norway rat’s (13.4-19.1 mm). Rattus rattus is a very agile and frequent climber; rarely burrows, nests mainly in trees and shrubs and is an infrequent swimmer. Rattus norvegicus burrows extensively, nests underground and is a strong swimmer. It climbs much less frequently than other rats and is very wary (see Cunningham and Moors, 1993).

    Yuan et al. discuss the potential of image analysis methodologies in differentiating between the tracks of different rat species.
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