how does this island affect the animals?
For example, ant colonies in urban heat islands have an increased heat tolerance at no cost to cold tolerance, and Grey-headed flying foxes, found in Melbourne, Australia, colonized urban habitats following increase in temperatures there.
Urban heat island
Ant colonies in urban heat islands have an increased heat tolerance at no cost to cold tolerance.

urbanization is the cause of urban heat island a condition that could be described as The modification of land surfaces
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Urban heat island [SEP] Impact on animals
With temperate climates, urban heat islands will extend the growing season, therefore altering breeding strategies of inhabiting species. This can be seen the best in the effects that urban heat islands have on water temperature. With the temperature of the nearby buildings sometimes reaching over 50 degrees different from the near-surface air temperature, precipitation will warm rapidly, causing runoff into nearby streams, lakes and rivers (or other bodies of water) to provide excessive thermal pollution. The increase in the thermal pollution has the ability to increase water temperature by 20 to 30 degrees. This increase will cause the fish species inhabiting the body of water to undergo thermal stress and shock due to the rapid change in temperature to their climate.