black rat

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Related to R. rattus: Black rats, roof rats

black rat

n.
A common rat (Rattus rattus) found worldwide, especially in populated areas, having a black or dark brown coat.

black rat

see black rat.
References in periodicals archive ?
The difference in size and external dissimilarity between R.
ingens has a longer rostrum and wider zygomatic arches than in R.
The skull of Nesomys has a remarkably long rostrum and slightly broader zygomatic arches than R.
The close morphological similarity in size and body proportions between Nesomys species and R.
norvegicus may make it a potential competitor for R.
Based on the degree of dimensional and ecomorphological similarity, we estimate the probability of interspecific competition as (1) very high between R.
Arab traders during this same period (8th-10th century) also probably were responsible for first introducing black rats into eastern and southern Africa, as evidenced by R.
Excavations in Birka yielded skeletal remains of R.
The internal isolation of much of France probably explains the late re-introduction of R.
This may explain the late 10th-century record of R.
All this would have favoured rat infestation, and the archaeological record is beginning to confirm that R.
This size difference may have arisen out of the lack of interspecific competition: R.