This amazing jellyfish-like creature is known as a Portuguese Man o' War (or Caravela Portuguesa) and was found on a beach in Olivenca, Bahia, Brazil. This siphonophore has many venomous tentacles that have an extremely painful sting.
In Laguna, Brazil, dolphins herd fish toward fishermen on the beach and then signal them when to toss their nets. The dolphins then get to feast on the fish that are not caught. This is an untrained behavior and has been going on since the mid 1800's.