In the 1st century A.D., Pliny the Elder wrote of the stupidity of the ostrich that thrusts its head and neck into a bush, imagining "that the whole of the body is concealed."
In the 21st century A.D., Ze the Frank said "Wikipedia - home of the C+ term paper."
Pliny had never actually seen an ostrich and ostriches don't bury their heads in bushes or, indeed, sand. These facts are confirmed by Wikipedia.
Be careful what you believe.