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Fred hollows made a difference by giving people their eye sight back and helping hundreds of thousands of people
He didnt actually invent anything thing or instrument but he did make eye surgery a big thing in new Zealand and Australia
HE contributed by inventing a medicicne that cures any injurine anywhere. But mostly it is for lost vision ( people who have lost their eye sight)
hollows
No. Kookaburras are not nest raiders. They make their own nests in tree hollows, or in hollows within termite nests up in trees. They will use their strong beak to dig out the hollows to enlarge the space. They lay their own eggs in their own nests, and do not raid the nests of other bird species. However, kookaburras have been known to eat the chicks of other birds on occasion. This is not their normal diet, as they prefer to swoop down and collect small reptiles from the ground.
About 30- 50mil
indecision
Fred loves to make videos. That's his greatest hobby.
Most owls make their nests in tree hollows. Some owls like the burrowing owl dig their own nests in the ground. Some owls in deserts will sometimes make their nests in cactus hollows
Koalas do not make homes of any kind. They do not make nests or shelter within hollows. They simply cling to the limbs of the eucalyptus trees they inhabit.
There are no plans for another movie. Unless JK Rowling writes more novels.
I hope not