Why do we hiccup?

"...there is one group of animals in which the peculiar combination of the contraction of these muscles and the closure of the glottis does serve a clear purpose: primitive air breathers that still possess gills, such as lungfish, gar and many amphibians. These animals push water across their gills by squeezing their mouth cavity while closing the glottis to stop water getting into the lungs."

Scientists believe it is a remnant from 370 million years ago, when as a species we crawled out of the ocean. We kept it, because it is similar to the action which prevents milk entering our lungs while suckling as babies.

It is a plausible idea, says Allan Pack, an expert in respiratory neurobiology at the University of Pennsylvania. "But it's going to be very tough to prove."

Why doesn't anyone suggest that the reason why we have this similarity with amphibians, is because it was recently that we last emerged from the water - and not millions of years.