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However, in this post, I’d like to lay out the basic numbers as we pretend to know them about overall bird mortality, human related causes of mortality, and somewhere in there I’ll note that the number of birds that are killed by windmills is so small that it says “zero” on my pie chart.
Thus the decision was made to kill 3,600 Barreds, and it’s hard to fault the inescapable logic of doing so, as one Audubon Society director expressed it: On the one hand, killing thousands of owls is completely unacceptable. Other animal control issues that involve mass killing make for easier decisions, according to Peter P.
This is approximated by the size of the animal, but really, this has to be adjusted for depending on modality of killing. We do know this: In areas where feral catpopulations exist, they are often well established. Here we conduct a systematic review and quantitatively estimate mortality caused by cats in the UnitedStates.
In short, the answer is that in the UnitedStates there are 20 billion birds at the end of the breeding and fledging season, which gets winnowed down to 10 billion by the following early spring. Hardly any Sandhill Cranes are killed by domestic (including ferrel domestic) cats. Raptors either. But this is problematic.
. …It is estimated that the number of free-roaming cats in the UnitedStates may be equal to that of owned cats, approximately 70 million. Free-roaming cats will hunt and kill birds, small mammals, reptiles, amphibians and fish, resulting in wildlife mortality.
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