22 facts about Horseshoe crab
These very distinctive animals were once much more widespread on earth. They belong to order Xiphosura , of which four species have survived to the pr ...
Jellyfish are fascinating creatures and the most ancient animals on Earth. Although boneless, toothless, and brainless, they are efficient predators armed with invasive toxins. There are so widespread, there are no water tanks not filled with at least one species.