All three introduced rodents have a pair of long, yellow incisors at the tip of the mouth on both upper and lower jaw. This is the only way to distinguish them from the protected native rodents. The House Mouse is usually olive-brown with a strong, musky scent. The Ship Rat can vary in colour from black through to white but is generally steel-grey with a white underbelly and quite a long tail. The Sewer Rate has shaggy fur and is coloured similar to the Ship Rat although generally is brown on the back with a dirty white underbelly and a short, thick tail.
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