All the world's pet dogs weigh 10 times all the world's pet cats

Interested? Perhaps not but I think the statistic in the title is mildly interesting. Perhaps the more interesting statistic is that the weight of all humans on the planet at present is 18 times more than the weight of all land based wild mammals. 

But ants weigh about four times more than wild mammals! Those pesky ants are almost weightless as individuals but there are an awful lot of them.

Infographic my MikeB.

Perhaps the more extraordinary statistic from a study (The global biomass of wild mammals) by Prof Ron Milo and colleagues of the Weizmann Institute of Science in Israel is that the total biomass in tonnage of humans is almost 18 times more than all the wild mammals on the planet combined. 

To that perhaps remarkable statistic we have to add the 630 million tonnes of livestock kept by humans and other mammals that would not exist without us such as urban rats.

As the Infographic shows you, the biomass of all land-based wild mammals is about 22 million tonnes.