
Originally Posted by
walrus
Yet we chastise cats for killing too many birds
Cats killing songbirds is indirectly the result of human activity too, and has been a factor in the decline and even the extinction of many species.
Humans bring cats into environments where they don't belong, nearly every household has a pet cat or sometimes several cats.
Humans also brought destructive rats into Britain, North America, and numerous Islands both
rattus rattus (aka roof rat, black rat, bubonic plague rat) and
rattus norvegicus (aka brown rat, street rat, sewer rat, wharf rat), and that's played a role in the decline of many species.
Current range of
rattus norvegicus:

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