Causes and consequences of avain range expansion

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When we observe a house that is occupied, we may generally assume that the house is habitable. Our assessment of the house may be improved if we see that a happy family lives inside. Either of these cues is a shortcut to determining the quality of the house, without actually trying it out for ourselves. It turns out that animals assess habitats in the same way. This behaviour is under such strong selection that previous experiments have shown birds will occupy unsuitable habitats (akin to parking lots for humans) if they observe others there.