Humans have effected wild animals by killing them for their fur or meat and their numbers have dropped alot.
also elk-bison-reindeer--whale--bear-squirril--horse--wild turkey --duck-- aardvark( which by the way is out of this world if marinated in balsamic vinegar about 2 hours before you broil it)
The zoo is much safer. 'Nature is red in tooth and claw.'
any really wild animals like lions and giraffes and elephants etc
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