Now that you read that, I am sure, the data your friend told you is only to support him finding snakes.(I am guessing as I don't know him/her) Its not about the snakes or how predators utilize the hognose. The defensive reaction hogs use is aimed at their predators, not us or a easy way we find them.
Whats interesting is your numbers, two. That number cannot predict behavior in any way. Remember, Behavior is a trend, most do this, some do that, and others, well they are goofy and do none of the above. That's normal for behavior. In order to understand behavior, you must use numbers, then numbers in different conditions.

Behavior is not restricted to type of snake or even snakes. With snakes, this is very normal. They utilize different defenses, based on ability and ability is tied to temps. When cool, freeze(go cryptic) when hot, run like the wind, when inbetween, pick one and or, kiss your butt goodbye.

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