Many skeptics assert that the Bible must be wrong, because they claim that the Ark could not possibly have carried all the different types of animals. 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?

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.’….

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