Which kangaroos should we trust?

Logic Level 2

There are at least two kangaroos in the enclosure.

One of them said: “There are 6 of us here” and he jumped out of the enclosure.

Afterwards, every minute one kangaroo was jumping out of the enclosure saying: “Everybody who jumped out before me was lying.”

This continued until there were no kangaroos left in the enclosure.

How many kangaroos were telling the truth?

Source: MathFights.

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