It is not realistically possible for Noah’s Ark to have housed Earth’s biodiversity based on basic numbers and biology. Scientists estimate 8–10 million animal species exist today, including 5–6 million insect species. Even limiting the count to animals and excluding plants and microbes leaves millions of organisms that would need space, food, and care. The biblical Ark’s volume (about 40,000 m³) is comparable to a small cargo ship and could not physically accommodate more than a tiny fraction of this life, let alone their food, water, and waste.
Even the claim that only “kinds” were taken fails under genetics: modern species diversity could not arise from a few thousand founding animals within a few thousand years without catastrophic inbreeding. Many species also require specific diets, climates, or host organisms (especially parasites and insects) to survive, making long-term containment impossible. Finally, the existence of region-specific animals (such as kangaroos or lemurs) and the absence of global migration evidence after a flood further contradict the scenario. Together, species counts, space limits, genetics, and biogeography show the Ark story cannot be literally feasible.