this this and this. the word "million" has more effect when you say 999 thousand cats plus 1,000 cats and if one cat took up 1/2 square foot, they would take up 500,000 square feet that is roughly the area of ground zero. plus lets say one cat takes up .25 cubic feet, that is 250,000 cubic feet of cats, A t-rex only takes up about 600 cubic feet which is about 2/5 of what the cats take up