An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life.

Three scientists have discovered a 300 million year old fossil specimen of an invertebrate worm in the southern city of Zagora, Morocco, reports The View from Fez.

It is known from only a few specimens, and current estimates put its maximum size at long, based on analysis of smaller and immature specimens, making it the largest known invertebrate.

While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system.

During the digging, mountain blasting and clearing of thick vegetation, about 3,000 invertebrate and 500 vertebrate fossils were found, and also over 250 plants from a forest consumed by fire of a volcanic explosion, pointed out Hortensia Broce .

And the aquarium had a lot of big fish tanks but not a lot of invertebrate displays, and being the spineless guy, I thought, well I'll just go out in the field and collect these wonderful animals I had been learning about as a student and bring them in, and I built these elaborate sets and put them on display.