Solve this when you are a lil bit relaxed

A hen and her 3 little chickens were trying to cross a busy highway.

After great efforts they all managed to cross it. One of the little ones yells out happily-"Wow....after so much efforts, all 5 of us managed to cross"....

Qn. Why does the little one say "all 5 of us" ????

Think a little bit ....... Its easy !

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