Why do some Christians say that the dinosaurs were destroyed in the flood, when the Bible says that 2 of every animal went onto the ark?

"And of every living thing of all flesh, two of every sort shalt thou bring into the ark, to keep them alive with thee; they shall be male and female."
It does not say that there were any exceptions, but specifically says that every animal were to be taken aboard and that Noah complied with this.
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