What are the bee­tles on oak trees with ex­tremely long noses?

BBC Wildlife Magazine - - Q&A - RJ

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.

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