The wild animals that become obese are ones that have access to human food and garbage. It's not like fish swimming in the runoff from chemical plants become obese (they develop other disorders but not obesity as far as I'm aware).
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Again, this explanation doesn't stand up to scrutiny. Lab animals in controlled environments are also getting fatter: https://royalsocietypublishing.org/doi/abs/10.1098/rspb.2010...
Those aren't wild animals.