According to Genesis 6, Noah brought two of each kind of animal onto the Ark.
Genesis 6:19–20 instructs Noah to bring a male and a female of every kind of bird, land animal, and ground-moving creature. This pairing supports the story’s emphasis on preserving animal life and allowing creatures to reproduce after the flood.
Genesis 7 adds a more specific instruction concerning animals classified as clean: Noah is told to take seven pairs of clean animals and one pair of animals that were not clean. This later detail is why summaries sometimes give different animal counts.
The question’s answer refers specifically to the general instruction in Genesis 6, not the more detailed clean-animal instruction in Genesis 7. The text also speaks in broad categories rather than using modern biological species definitions, so “kind” should not automatically be equated with a modern species.