Dinosaurs were the rulers of the Earth for 135 million years, but due to a cataclysmic comet 65 million years ago they disappeared. Fossil records show that a number of prehistoric animals were not just massive, they were huge. These enormous sized creatures roamed the Earth before the ascendancy of humanity. Our ancestors lived on Earth together with these huge beasts. Some giants are far gone however there are quite a few that still exist. If humanity disappears from the Earth they might come back again, the chances are high. Сreatures from ancient times appear every so often proving they are still around us. Seeing them is like a journey in the Earth’s history. Not everyone is so lucky to get a chance to see them in reality, still it’s possible to find out more about them and their ways. Let’s start our journey, shall we?

1. Horseshoe Crab
The 25 millimeter-wide Lunataspis aurora which existed 445 million years ago was discovered in 2008. Safe to say this is the oldest horseshoe crab. Currently there are 4 species which look pretty much the same as their ancestors. Media calls them the “living fossils” but that’s not exactly the case and as we know appearances can be misleading. Evolution took place and they have changed drastically in the last half-billion years. Yet some features remain the same. For example now they have only one limb as opposed to prehistoric species that had limbs split out into two branches. Technically speaking they’re not precisely crabs as they don’t have antennae. Their spiked tail can obviously sting and many think that it’s the only purpose of the above.

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However the tail is also responsible for rudder duties and when the arthropod gets stuck on it’s back the spiked tail comes in handy once more. Ever wondered how they get from point A to point B? Mature horseshoe crabs walk on the ocean floor, however young ones can swim upside down, they often flip over and start propelling their bodies through the water. Not many crabs survive into adulthood. Only 10 embryos out of 90,000 eggs can become adults. Female horseshoe crabs mature more slowly and usually they are bigger in size than males. Last but not least, horseshoe crabs have a blue blood which is widely used in vaccination, however as you might have guessed already it comes at some cost, $15,000 per quart to be precise.

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