Unfortunately for the clam, this does not do any good when the predator is a human being looking for an easy meal, and over-exploitation has severely impacted many populations. It has now been discovered how to culture them artificially in the same way as temperate zone shellfish like oysters and mussels are, and this has enabled restocking of areas where they have been eliminated. This may cause some problems down the line though, as the cryptic species effect may mean that animals adapted to quite different conditions and local environments are being distributed well outside their natural range, where they could potentially hybridise with native stock.
Next week, part one of a round up of the year
(images from wikipedia)