Next to humans, what is the most populated animal species in the world?

Question

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Answer 1

Rats and cockroaches and earthworms.

Answer 2

Insects of course top everything.  You could take the weight of all the known mamals, birds, reptiles and fresh water fish, and come up with only a FRACTION of the weight of the insect world.

Rodents far outnumber humans.  Something for you to think about...everywhere humans live, there are at LEAST two rats for them.  

So if you live in a town of 10,000 people, there are 10,000-20,000 rats living in that town with you.  If you live in a city of a million people....!!!!

Certain species of birds outnumber humans.  Also of course many species of ocean going fish.

~Garnet

Permaculture homesteading/farming over 20 years

Answer 3

Humans are not even close to having the largest number.  the total WEIGHT of ants exceeds the total weight of humans, and so there are many thousand times more ants than humans.  Same with all sorts of other insects and animals.

Answer 4

roaches...they are everywhere.....I know they aren't animals but they never die they just multiply

Answer 5

I have to say 'krill' overall and i think on land and by biomass the honour goes to nematodes, but youd have to check that, it may be nematodes have the most species, not necessarily the most numbers within a species, but thats what seems to be ringing a bell

I agree there are a massive diversity of species within the insect groups (i believe Coleoptera are at the top in that respect) but im not sure that applies to biomass or abundance WITHIN species groups necessarily

It is NOT ants, termites or fish, or roaches

Note the answer by AC is misleading these are the most speciose groups NOT the most abundant species!!!

Answer 6

       On my opinion the fishs which lives in the seas and in the oceans

        It is more populated animals    ???????????

                    Thankyou  

Answer 7

Termites-greater than any other

Answer 8

Humans aren't the most populated, so it would very well be some type of insect. I'm not sure which, but I know there are around 100 quintillion insects in the world (which is so many 100,000,0000,0000,000)

Answer 9

Humans aren't really a species of animal they're really more like a sub species, but, out of all the animals we have discovered, the most species of animals in the world table goes like this:

Insects:950,000

Arachnids: 75,500

Molluscs: 70,000

Crustaceans: 40,000

Fish: 29,300

Nematodes ( unsegmented worms): 20,000

Flatworms: 17,500

Segmented worms: 12,000

Sponges: 10,000

Birds: 9,934

Jellyfish, coral, etc: 9,000

Reptiles: 8,240

Starfish: 6,000

Amphibians: 5,918

Mammals: 5,416