It seems like no matter where I go, I come across sights like this:

All that's left of two little sharks
The fact that I took these photos inside a national marine park in the Sea of Cortez just compounds the tragedy.
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Two hammerheads. Sadly, just their heads.
All the sharks pictured above were small, basically pups. I suppose it should be obvious that killing young sharks means fewer individuals of breeding age going forward, which of course means fewer and fewer sharks in the future...but I guess this self-evident point escaped the person or people responsible.
To make matters worse...there were many, many more shark heads scattered on this particular beach. I gather that it's not a particularly unusual sight in the area, which begs the question of what purpose a national marine park serves. If any.