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City Birds Switch to Singing at Night

According to new research, it appears that British robins have switched to singing at night when in urban environments, in order to be heard:

“There are two ways of looking at these results,” says Fuller, who admits he does not know if the birds that sing at night are vocal in the daytime too. “On one hand, you could conclude that these birds are highly adaptable to the urban environment. On the other, it could be that they are suffering from the poor-quality habitat and having trouble attracting a mate.”

Urban Ants and Heat Tolerance

About a month ago, I discussed the Heat Island Effect (where cities are warmer than their surrounding areas). Well, it turns out that this phenomenon has affected the evolution of the organisms that live in cities, or at the very least, ants. In their paper Urban Physiology: City Ants Possess High Heat Tolerance Angelleta et al. demonstrate that urban ants have a higher heat tolerance than rural ants. Further studies will have to be done on city mice and country mice.