Story highlights A father and son put a bison calf in their car thinking it was cold

Rangers tried to reunite it with the herd but it didn't work

(CNN) You know what they say about the road to hell and good intentions?

Well, the folks at the National Park Service are urging you, begging you, harshly warning you to leave the bison alone.

Even if you do find a baby one wandering around and load him into your car, thinking the poor calf is cold.

That's what a father-son duo did a couple of days ago at Yellowstone National Park when they spotted a newborn bison and thought it was cold and lost.

Wrong move.

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