Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Urban wildlife is wildlife that is able to live or thrive in urban environments. Some urban wildlife such as the house mouse are synanthropic, ecologically associated with humans. There are several different types of urban area which can support different kinds of wildlife.Urban environments can exert novel selective pressures on organisms are for example, the weed Crepis Sancta, found in France, has two types of seed, heavy and fluffy, the heavy ones land near by to the parent plant, whereas the fluffy seeds float further away on the wind. In urban environments seeds that float far will often land on infertile concrete. Within about 5-12 generations the weed has been found to evolve to produce significantly more heavy seeds than its rural relatives. Among vertebrates a case is urban great tits, which have been found to sing at a higher pitch than their rural relatives so that their songs stand out above the city noise, although this is probably a learned rather than evolved response.
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