Quote of the day: Change alone is eternal, perpetual, immortal.
I'm back again with some information on fishes.
Basically fishes are the oldest vertebrates of the world. What are vertebrates? They're animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium. Which means that they were found the first. The first fish supposedly was found around 500 million years ago. Imagine that. They are aquatic, typically ectothermic (cold-blooded). Obviously everyone knows that their bodies are covered with scales, two matching fins and a few other non-matching ones. They breathe using their gills, which perform exchanges between the fishes' blood & water. Most fish have a bony skeleton, except rays and sharks. Mostly feed on plants, similarly, fishes such as shark don't feed on plants. On other creatures, instead.
Plainly, there is a huge variety of fish, differing in size, shape, color. You name it. Their sizes highly range from 8mm long stout infant fish to 16m whale shark. That's just stupefying. There are around 28,000 known species of sea-animals around the world. Known. Maybe not to us, but to others. Imagine how many other unknown creatures there are? Out of all of it, almost 27,000 species include bony fish. Remaining 970 species include rays, sharks and chimeras and 108 lampreys and hag fishes. You might have not even heard of them. Believe it or not, chimeras are real. Lampreys are standardized with eels or slugs, they have sucking mouths and rasping tongues. Hag fishes are also similar to lampreys, eels, slugs. It kind of looks like a water snake though. Fishes are found in all types of water bodies in the whole WORLD. Certain fishes can be kept in aquariums as pets or puppets of adoration while some others can be served as tasty food.
So you see, fishes are not just plain, boring, colorful animal. (colorful can't be boring, ey.) They actually vary in their habits, nature, types, what they are capable of and things like that. That's why I find them quite interesting. And this is just the intro of these wonderful creatures. Wait until I post about many types of fishes.