What is this creature? Where can it be found?
The creature in the man's hand is a baby eel. Giveaways: it has fish eyes and the flattening of the tail. The lower right picture suggests it's a vertebrate (i.e. not a worm.)



Exactly which eel it is is unclear, but you can read more about it in the linked article. Indeed, your first picture appears in the article.


  These transparent wonders are not a species, but rather they are the second stage in the life cycle of a number of eel species in the family Anguillidae. This particular specimen is an American eel, Anguilla rostrata. For the rest of the post I'll focus on the life cycle of this species for simplicity's sake.