Head to head
Common Cockle vs Razor Clam
Common Cockle
VS Razor Clam
The common cockle and razor clam are two bivalves that live buried in sandy shores and are gathered for food, but they escape danger very differently.
| Common Cockle | Razor Clam | |
|---|---|---|
| Scientific name | Cerastoderma edule | Ensis directus |
| Shell | A rounded, heart-shaped shell, usually around 5 cm across, with strong ridges radiating from the hinge | A long, narrow, elongated shell that closely resembles an old-fashioned straight razor |
| Feeding | A filter feeder drawing in water through a siphon and straining out microscopic algae and particles | A filter feeder consuming plankton and organic particles through siphons |
| Burrowing | Lives just beneath the surface of sandy and muddy shores, with its siphon reaching up to the water | Burrows vertically in sandy shores, and can dig straight down within seconds using a powerful foot |
| Escape | Flicks its long, muscular foot to jump several centimetres, escaping from starfish and other predators | Detects vibrations in the sand, such as footsteps or a digging predator, and retreats extremely fast deeper into its burrow |
| Habitat | Sandflats and muddy estuaries of the northeast Atlantic, from Norway and the Baltic south to West Africa | Sandy intertidal and shallow subtidal habitat along Atlantic coastlines |
| Human and wildlife use | Gathered by hand and with rakes for thousands of years, and a main food of wading birds such as oystercatchers | Harvested as a popular food source in various coastal regions |
| Conservation status | Not Evaluated globally, though locally abundant | Least Concern |
Common Cockle vs Razor Clam: common questions
Which bivalve can jump?
The common cockle, which flicks its long, muscular foot to jump several centimetres and escape predators such as starfish.
Why is it called a razor clam?
It is named for its long, narrow, elongated shell, which closely resembles an old-fashioned straight razor.
Which one feeds wading birds?
The common cockle, which is a main food for wading birds such as oystercatchers.