Can now be considered fully naturalised on the Upper Rock. Abundant within the Nature Reserve. The areas around Jews' Gate, St. Michael's Cave, the Ape's Den, Cable Car Top Station and Upper Galleries are the locations where on occasions the Tourist Board has received complaints of rat infestation. During the winter months these animals often prefer the warmer temperatures of the caves and tunnels, and it is very often in these two places where these animals have been targeted. In such cases the rats will ingest the poi son and will often wander about before dying. This may not necessarily take place inside the building, cave or tunnel that was being tackled, and sometimes the animal will die out in the open where it will be consumed by other animals, which will also die in the process. (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
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Invasive (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
Although these will feed on practically anything, within the Nature Reserve they seem to be mainly frugivorous in nature, with a particular taste for pine seeds (pine cones that have been attacked by rats are a common sight on the Upper Rock). (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
The Tourist Board has received complaints of rat infestation. The rats will ingest the poison and will often wander about before dying. This may not necessarily take place inside the building, cave or tunnel that was being tackled, and sometimes the animal will die out in the open where it will be consumed by other animals, which will also die in the process. (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
Terrestrial. Originally from Asiatic countries. The black rat is preyed upon by some of the predators of the Nature Reserve, particularly the larger snakes such as the horseshoe whip-snake Coluber hippocrepis, Montpellier snake Malpolon monspessulanus, and ladder snake Elaphe scalaris. (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar;