The reason I am concerned about the rattlesnake is that where I live, the most common serpent is the Mojave, a highly toxic critter. I have seen many of them over the years. Last Oct I stepped within a foot of one, lucky for me it was a cool morning. My kid runs around like most kids do, and does not look where the feet are being placed. I realize that snakes are more afraid of us than we are of them, but in the unlikely event that my little one was envenomated by a Mojave out in a national park, I would not have a lot of time to get where I know I need to go (Hi desert Medical).
However, the most fearsome of all creatures encountered in the wilderness is bipedal. Lucky for me, my little princess is uneasy with strangers, so she immediately clings to me when one is spotted. Thus, I tend to fret more about a serpent coiled up under a trailside bush than I do about child predators.
In the city (civilization) it's a diffrent game, and she plays and all, but papa hawk is always perched on a nearby branch. The funny thing is the closest she ever got to a wild rattlesnake was at the city park. One was coiled up under the monkey bars! I let the park staff know, and they removed the offending rattler, and relocated it to the nearby desert (something I specifically requested, and they did just that).
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