Current estimates of the total number of species on Earth are estamated at 17500000. Multiply that by two for a mating pair we get 35000000
35000000 / 7 days = 5000000
5000000 / 24 hours = 208333.3
208333.3/ 60 mins = 3472.2
So this would mean that on average 3472 animals would have entered the Ark per minute. I find this vary hard to belive considering the Ark was only aprox. 450ft x 75ft x 45ft.
Edited by DD2014, : No reason given.