Here's Dr. Duke's response to the ostrich factoid:

Yes, the brain is the size of a golf ball in adults. The eye is about the
size of an adult human eye and is the largest eye of any land mammal.

Gary Duke
Prof. (Ret.)...

But is the human eyeball or slightly larger for the ostrich eye larger or small than a golfball? Hmmmmm, the search for facts continues...