What are the beetles on oak trees with extremely long noses?
These are the acorn weevils Curculio glandium and C. venosus. The long snout (rostrum) has tiny but powerful jaws at its tip, which the female uses to drill a deep hole into the middle of a developing acorn. Then she turns round and using a telescopic egg-laying tube deposits a single egg into the centre. The grub feeds on the growing acorn and when it drops in autumn the larva chews an escape hole and pupates in the soil.
All weevils have snouts of varying sizes, with length usually correlating with larval fooddstuffff and egg deposition site – so short-snouted weevils chew a much shalloweer hole. Males and females both have snouuts, but the egg-layying female of the species almostt invariably has the longer.
From little acorns, acorn weevils grow.