This reminds me of a documentary in an aquarium where a shark co-existed peacefully with a small pod of dolphins. However, when one of the dolphins was going to give birth, the pod turned on the shark and killed it. They probably decided that having a shark in the tank was too much of a risk for the newborn.
I had a coworker who was once an underwater dive guide. He said that he never worried about sharks, particularly Great Whites, because they just chill when not hunting. Dolphins, however, always made him worry because in his words, “Dolphins are assholes!”
I was fishing in Australia about 12 months ago when this Bull shark beached itself about 25/30 feet from where we were fishing. I thought thats weird , at first I thought it was a croc but no. A big Dolphin was chasing this shark and I can tell you the shark was scared, they don`t beach themselves , especially Bull sharks. A couple of moments later we spot what we assume was a female and a small baby about 50 meters away. I truly believed at the time that the big dolphin was protecting the baby. Now I`m sure.
You missed what I would consider the dolphins’ main advantage: Dolphins have lungs which can breathe air and sharks have gills which they use to get their oxygen from the water. As an air breather, the dolphin’s lungs have the ability to support a much quicker metabolism, and therefore much higher energy output, than the gills used by a shark. This is because in each liter of air there is 210 ml. of oxygen, while there is only 5 ml. of oxygen in the same amount of water. In terms of swimming power and endurance, dolphins win by a mile.
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