2. Endangered status: There are about 600,000 common bottlenose dolphins around the world. The recently identified species of bottlenose dolphin may be protected in the future.

3. Classification: Common bottlenose dolphin, Indo-Pacific bottlenose dolphin 

Finally, in 2011 researchers in Australia published research that a third species of bottlenose dolphin existed. They named it the Burrunan dolphin. 

4. Life span: The average lifespan of a wild bottlenose dolphin is about 25, while a dolphin in captivity can live for over 50 years. Females tend to live longer than males, and the oldest dolphin on record was a captive female who lived to be 53.

5. Diet: Bottlenose dolphins eat a great variety of seafood, including fish, shrimps, crabs and squid. Though bottlenose dolphins have teeth, they use them to hold on to their prey. They don’t chew but swallow prey whole

+ Some scientists believe that they have a language, as opposed to calls and sounds other herd animals make to warn of danger or draw attention to food. 

+ One of the things that makes the bottlenose dolphins attractive to humans is that it can move its neck and make nodding motions as if it understands what it’s being told.

2. Endangered status: No exact count of the bull shark population exists. They are seen frequently throughout their habitat and appear to be plentiful. Despite this, currently no plan exists for their protection.

3. Classification: only one species.

4. Life span: Bull sharks live an average of 16 years in the wild. It is possible for them to live longer, especially in an aquarium. The oldest bull shark known was 32 years old.

5. Diet: Bull sharks are carnivores, meaning their diet is made up of meat, including fish.

+ Strongest bite pressure: The highest shark bite pressure ever recorded for any shark of their size.

+ Bull sharks are one of the most dangerous shark species to humans. They rank in the top three for attacks on people, along with the great white shark and the tiger shark.
+ Research suggests sharks do not see humans as enticing prey, and most "attacks" are actually exploratory bites, after which the shark typically moves on. 

2. Endangered status: Due to overfishing, many bluefin stocks are in peril. The Pacific bluefin is vulnerable, the Atlantic bluefin is endangered, and the southern bluefin is critically endangered.

3. Classification: The Pacific, Atlantic, and the southern bluefins.

4. Life span: The bluefins that survive will take up to 8 years to develop and live some 20 to 40 years in the wild.

5. Diet: The bluefins consume squid, shellfish, and bony fish. 

+ The bluefin tuna fish has excellent vision, perhaps the best of any bony fish.

+ The bluefin is nutritious and well-regarded for its meat. However, due to its long lifespan, high mercury levels do accumulate in its flesh, so it should be consumed infrequently. Also, they are really expensive to buy.
+ Bluefin tuna can raise their body temperature. This is to allow them to hunt in colder water quicker and more intelligently.

2. Endangered status: Today, the Blue Whale is listed by the IUCN as an animal that is Endangered in its oceanic environment with less than 20,000 individuals thought be left around the world.

3. Classification: There are three recognised of the Blue Whale which are the Northern Blue Whale, the Southern Blue Whale and the Pygmy Blue Whale.

4. Life span: 30 - 45 years.

5. Diet: Krill, crustaceans, small fishes.

+ The Blue Whale is the largest animal on the planet meaning that numerous organs are much, much bigger than those found in any other animal.

+ Also, the heart of the Blue Whale is so big that it is around the same size as a small car.
+  Despite their humongous size, blue whales eat tiny shrimp-like crustaceans called krill. But they shift a fair few of these seafood snacks – up to 40 million each day, in fact!

2. Endangered status: there is little known about the current population density. However, it is currently classified as a species of least concern.

3. Classification: The colossal squid is also known as the Antarctic squid.

4. Life span: the details are unknown.

5. Diet: Patagonian and Antarctic toothfish are thought to be primary prey targets along with other types of fish and smaller squid species.

+ Record Eye Size: Colossal squids have the biggest eyes recorded in the entire animal kingdom with diameters of up to 16 inches.

+ Researchers believe they are a primary food source for sperm whales that frequent the same waters.