Bivalve shells are made to open and shut, but on what a number of patterns is the hinge constructed, from the long row of neatly interlocking teeth in a Nucula to the simple ligament of a Mussel!
anitz partez formaturiko eta elikagarri bihurturiko mami edo haragiz bildurik eta nabarmenki koloretsu direlako txoriak erakarri eta haziok jan ditzaten;