Science ... Man's heart is set only on doing evil. This sort of thing was the reason for The Flood - and then Babel. Before Babel they were all of the first language, the language of creation ... they were all of one accord ... and their hearts were set only on doing evil.
Oh, the more it changes, the more it stays the same; and The Hand just rearranges, the players in the game. (The Moody Blues)
A video I watched on this claimed you would only need 5 of these hybrid creatures to supply the entire globe with whatever the end result production would be (antibodies, etc.)
But here they are at 150. and that was 10 years ago...