Swallow populations plummeting in Metro Vancouver
A species of Metro Vancouver swallows are declining rapidly. Derek Matthews, chair of the Vancouver Avian Research Centre, says that populations of barn and bank swallows in particular have fallen by up to 98 per cent in Greater Vancouver since 1970 and the decline seems to be speeding up.
According to the study, causes of the populations declination is a combination. From the loss of natural and artificial nesting habitat to the widespread use of pesticides on agricultural land and an increase in light pollution throughout Metro Vancouver all hold a part.
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