Acorn Weevil Curculio glandium
In Western Europe alone there are some 700 species of real weevils or Snout Beetles. Many weevils are very small indeed and therefore hard to identify. But bigger species also do look like eachother very much. The borers are part of the weevil family too. They deposit their eggs in unripe seeds, such as nuts. The larva eats the fruit from the inside. When the fruit falls on the ground in autumn, the larva creeps out, digs a small hole in the ground and overwinters there. A well-known and much feared species is the Hazelnut Borer. Borers have very long snouts indeed, often bended. On oak we often encounter the Acorn Weevil (or Acorn Borer) below. In females the snout is about the length of the entire body. Males have a shorter snout. Like many weevils this is a very small species, reaching a length of 4 to 8 mm. The Acorn Weevil is a very common species in Europe, Northern Africa and Turkey. By the way: the common name Acorn Weevil is sometimes used for other species as well, much the same way the words 'wasp' and 'gnat' are used for several, often very similar species.
