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According to the US Fish and Wildlife Service , there are about 10 billion breeding birds in the US. The maximum population size may be closer to 20 billion in the fall, and 10 billion at the start of the Spring breeding season. How many birds to cats kill 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.
They may be “outdoor cats” with a specific owner, stray pets, feral, or may have originated in one household and are now fed or cared for by other households in the neighborhood. …It is estimated that the number of free-roaming cats in the UnitedStates may be equal to that of owned cats, approximately 70 million.
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