One creationist claim that's commonly laughed at is this idea that 8 people could build a great big boat, big enough to hold all the 'kinds' of animals, and that those same 8 people were an adequate work force to maintain all those beasts for a year in a confined space on a storm-tossed ark. So the creationists have created a whole pseudoscientific field called baraminology which tries to survey all of taxonomy and throw 99% of it out, so they can reduce the necessary number of animals packed into the boat.