WATCH: David Muir shares milestones of Fort Worth Zoo's Sumatran tiger cubs

The Fort Worth Zoo has welcomed its first-ever pair of critically endangered Sumatran tiger cubs. The zoo is currently tracking the milestones of the newborn animals.
The Fort Worth Zoo in Texas has welcomed pair of critically endangered Sumatran tiger cubs — the first in the zoo's history. David Muir shares the milestones they've already reached.
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