New Zealand has just one species of swallow: the
Welcome swallow. Seventy years ago it had none, other than an occasional vagrant (yes, 'vagrant' is the term the bird people use for individuals that find themselves here by accident after being blown off course by storms or, I suppose, when their usually remarkable navigation systems go haywire). But, in the second half of last century, these delightful little birds began to spread rapidly throughout the country, and they're now almost ubiquitous. This is one of two that hang out in the implement shed where I park my car.
This was an entirely natural process, and I know of no one who has expressed concern about the effects of this colonisation. But, if Welcome swallows had been deliberately or accidentally introduced by humans, would they have been considered a worrying invasive species? Would they, in other words, have been considered unwelcome?
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All content © 2016 Pete McGregor