Most of the species of dolphins live in saltwater but there are some that are able to do well in the freshwater locations. They are mainly found in the freshwater of the Amazon River. They are easily seen by humans as they tend to stick to the swallow locations of the water.
It is amazing the difference in size of the various species of dolphins. The larger ones can weigh about 11 tons and be close to 30 feet long. The smaller ones are about 90 pounds and 4 feet long. Between those two spectrums you will find all weights and lengths. The species as well as their location play a huge role in their overall size.
The body of a dolphin is designed to help them move through the water quickly and without exerting huge amounts of energy. They rely on their pectoral fins and the fluke (tail) to help them navigate through the water.
Great easy to read facts from this site, check it out, there are some more amazing things on it. http://www.dolphins-world.com/
Their genetic siblings have already died off elsewhere: The Yangzte river dolphin in China was declared functionally extinct in 2006, the victim of pollution, overfishing and increased boat traffic.
This is intersting, the International Union of Conservation of Nature lists the Ganges river dolphin in India as endangered, and the Irrawaddy river dolphin in Bangladesh as vulnerable.
But if you are familiar with the topic you'll know about the dolphin slaughter in Taiji, Japan.
This little bit of info from http://www.opsociety.org/issues/dolphin-slaughter-in-taiji
Taiji is a little town 415km from Tokyo, but it hides a big secret, and unless you know what is going on, it is hard to comprehend what is happening.
The sea is red with blood, blood of dolphins.
I do not know much of this story nor the stories origins, but I feel that this is wrong.
Dolphins like anything in our oceans, are also at a huge risk of being caught in nets and on long lines.
This dolphin is a Maui Dolphin that is found in New Zealand, although not in any regularity, they are now extremely threatened, with only around 55 left, and only about 20 of those breeding females, it is expected they will be extinct by 2030.
This next photo has nothing to do with dolphins but I think it needs to be shown anyway.
Have a good evening!