If there's any animal that really doeesn't belong here in North America, it's cows. They can't even cope with harsh winter weather, they have to be sheltered and babied to a certain degree. As to their being problematical, I don't know about today, but when I was a kid they were constantly escaping and tramping on others' property. That is part & parcel of raising animals.
I have chickens. They originated in SE Asia. So, are they "feral" because I let them run around in the yard? They voluntarily go back into the hen house at dusk without any prompting from me.
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