"There is no way so many animals could fit hundreds of thousands of animals on the ark? It is simply impossible."
You most likely have heard this one before.
This has persuaded some Christians to deny the Genesis Flood, or believe that it was only a local flood involving comparatively few local animals. But they usually have not actually performed the calculations. On the other hand, the classic creationist book The Genesis Flood contained a detailed analysis as far back as 1961.1 A more detailed and updated technical study of this and many other questions is John Woodmorappe’s book Noah’s Ark: a Feasibility Study. This article is based on material in these books plus some independent calculations. There are two questions to ask:
How many types of animals did Noah need to take?
Was the ark large enough to hold all the required animals?
How many types of animals did Noah need to take?
Another problem often raised by atheists and theistic evolutionists is ‘how did disease germs survive the flood?’ … In fact, even now many germs can survive in insect vectors or corpses, or in the dried or frozen state, or be carried by a host without causing disease. Finally, loss of resistance to disease is consistent with the general degeneration of life since the Fall.
The relevant passages are Genesis 6:19–20 and Genesis 7:2–3.
Genesis 6:19–20:
‘And of every living thing of all flesh, you shall bring two of every sort into the ark to keep them alive with you. They shall be male and female. Of the birds according to their kinds, and of the animals according to their kinds, of every creeping thing of the ground, according to its kind, two of every sort shall come in to you to keep them alive.’
Genesis 7:2–3:
‘Take with you seven pairs of all clean animals, the male and his mate, and a pair of the animals that are not clean, the male and his mate, and seven pairs of the birds of the heavens also, male and female, to keep their offspring alive on the face of all the earth.’
In the original Hebrew, the word for ‘beast’ and ‘cattle’ in these passages is the same: behemah, and it refers to land vertebrate animals in general. The word for ‘creeping things’ is remes, which has a number of different meanings in Scripture, but here it probably refers to reptiles.2 Noah did not need to take sea creatures3 because they would not necessarily be threatened with extinction by a flood. However, turbulent water would cause massive carnage, as seen in the fossil record, and many oceanic species probably did become extinct because of the Flood.
However, if God in His wisdom had decided not to preserve some ocean creatures, this was none of Noah’s business. Noah did not need to take plants either—many could have survived as seeds, and others could have survived on floating mats of vegetation. Many insects and other invertebrates were small enough to have survived on these mats as well. The Flood wiped out all land animals which breathed through nostrils except those on the Ark (Genesis 7:22). Insects do not breathe through nostrils but through tiny tubes in their exterior skeleton.
Clean animals: Bible commentators are evenly divided about whether the Hebrew means ‘seven’ or ‘seven pairs’ of each type of clean animal. Woodmorappe takes the latter just to concede as much to the biblioskeptics as possible. But the vast majority of animals are not clean, and were represented by only two specimens each. The term ‘clean animal’ was not defined until the Mosaic Law. But since Moses was also the compiler of Genesis, if we follow the principle that ‘Scripture interprets Scripture’, the Mosaic Law definitions can be applied to the Noahic situation. There are actually very few ‘clean’ land animals listed in Leviticus 11 and Deuteronomy 14.
What is a ‘kind’? God created a number of different types of animals with much capacity for variation within limits.4 The descendants of each of these different kinds, apart from humans, would today mostly be represented by a larger grouping than what is called a species. In most cases, those species descended from a particular original kind would be grouped today within what modern taxonomists (biologists who classify living things) call a genus (plural genera).
One common definition of a species is a group of organisms which can interbreed and produce fertile offspring, and cannot mate with other species. However, most of the so-called species (obviously all the extinct ones) have not been tested to see what they can or cannot mate with. In fact, not only are there known crosses between so-called species, but there are many instances of trans-generic mating, so the ‘kind’ may in some cases be as high as the family. Identifying the ‘kind’ with the genus is also consistent with Scripture, which spoke of kinds in a way that the Israelites could easily recognize without the need for tests of reproductive isolation.
The Ark would probably have carried compressed and dried foodstuffs, and probably a lot of concentrated food. Perhaps Noah fed the cattle mainly on grain, plus some hay for fibre. Woodmorappe calculated that the volume of foodstuffs would have been only about 15 % of the Ark’s total volume. Drinking water would only have taken up 9.4% of the volume.
For example, horses, zebras and donkeys are probably descended from an equine (horse-like) kind, since they can interbreed, although the offspring are sterile. Dogs, wolves, coyotes and jackals are probably from a canine (dog-like) kind. All different types of domestic cattle (which are clean animals) are descended from the Aurochs, so there were probably at most seven (or fourteen) domestic cattle aboard. The Aurochs itself may have been descended from a cattle kind including bisons and water buffaloes. We know that tigers and lions can produce hybrids called tigons and ligers, so it is likely that they are descended from the same original kind.
Woodmorappe totals about 8000 genera, including extinct genera, thus about 16,000 individual animals which had to be aboard. With extinct genera, there is a tendency among some paleontologists to give each of their new finds a new genus name. But this is arbitrary, so the number of extinct genera is probably highly overstated. Consider the sauropods, which were the largest dinosaurs—the group of huge plant-eaters like Brachiosaurus, Diplodocus, Apatosaurus, etc. There are 87 sauropod genera commonly cited, but only 12 are ‘firmly established’ and another 12 are considered ‘fairly well established’.5
One commonly raised problem is ‘How could you fit all those huge dinosaurs on the Ark?’ First, of the 668 supposed dinosaur genera, only 106 weighed more than ten tons when fully grown. Second, as said above, the number of dinosaur genera is probably greatly exaggerated. But these numbers are granted by Woodmorappe to be generous to skeptics. Third, the Bible does not say that the animals had to be fully grown. The largest animals were probably represented by ‘teenage’ or even younger specimens. The median size of all animals on the ark would actually have been that of a small rat, according to Woodmorappe‘s up-to-date tabulations, while only about 11% would have been much larger than a sheep.
Another problem often raised by atheists and theistic evolutionists is ‘how did disease germs survive the flood?’ This is a leading question—it presumes that germs were as specialized and infectious as they are now, so all the Ark’s inhabitants must have been infected with every disease on earth. But germs were probably more robust in the past, and have only fairly recently lost the ability to survive in different hosts or independently of a host. In fact, even now many germs can survive in insect vectors or corpses, or in the dried or frozen state, or be carried by a host without causing disease. Finally, loss of resistance to disease is consistent with the general degeneration of life since the Fall.6
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How did all the animals fit on Noah's Ark? 
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