how many species in the world
We are not even sure how many different kinds of birds there are in the world. The answer to that is about 10 thousand. Several of these kinds, or species, are numbered over 3 billion in the world. Probably the most common, if you don’t count chickens that we raise for eggs and food, is the House Sparrow.
How many fish species are there? The first global census of life in the sea has logged some 230,000 species, however a ten year study on the subject performed by over 300 scientists warns of mass extinctions. This ten year study has been the largest, most extensive study to attempt a stab at that age old question “Just how many fish are there in the sea?”. The ten year study, which was published today, is attempting to answer that question.