How Australian scientists brought Norfolk Island’s thumbnail-sized snails back from the brink of extinction

First there’s a bulge on the right-hand side of the snail’s neck and then slowly – because everything in the snail world happens slowly – a fully formed baby snail emerges, shell and all.

In a quarantined captive breeding facility at Sydney’s Taronga Zoo, adult Campbell’s keeled glass-snails popped out more than 20 babies last week.