Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1972 , he found a dead baby of about 50 days old , which had presumably been born in captivity , at his wildlife park at Burleigh Heads on the Gold Coast , Queensland .
Simplified: He nearly did it again in 1972 at the David Fleay Wildlife Park at Burleigh Heads , Queensland , but it died at 50 days .