Sharks are the oldest existing fish species in this world. Sharks belong to the ancient fish family called Chondrichthyes, which means cartilaginous fishes which includes rays and sharks. These ancient animals have been around for over 400 million years!
The largest shark ever recorded is called Megalodon. It was estimated to be about 20 meters long and weighed more than 60 tons. It’s been pretty much confirmed that Megalodon is in fact extinct, however the question of whether or not it could still exist remains. There are certainly many people who believe Megalodon still lurks the seas, perhaps even the Pacific Northwest coast. However, there has never been any concrete evidence to suggest this theory is in fact true.
Do you know why sharks’ eyes glow in the dark?
It’s because they have a reflection from light-emitting organs called photophores. The organ produces green light that reflects off the retina making eyes look greenish at night.
Facts about Shark You Don’t Know
Sharks due to their fearsome appearance, great strength, and awesome eating habits are among the most feared creatures on Earth. Here are some interesting facts about these awesome fish:
Sharks belong to the oldest fish family around, which means they’re old school! Ancient sharks first appeared roughly 400 million years ago; that makes them older than dinosaurs by more than 220 million years. They’re thought to have evolved from bony fish, though really it’s best not to ask how. Fossil records suggest that there were bizarre, spiny, armored varieties of shark as early as the middle Devonian period (about 380 million years ago).
The largest and most terrifying predatory fish to ever live was Megalodon. As well as being a fearsome predator, this giant also has the record for being the biggest-ever cartilaginous fish. A great white can grow to over 20 feet in length, which is impressive but still pales in comparison to “big momma” Megalodon — she could have grown up to 60 feet long. Some estimates suggest her gills alone were about 2 meters wide! If you’re wondering what happened to such an impressive beast, it’s thought that she went extinct about 2.6 million years ago, in the middle of the Miocene epoch.
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