The red-backed shrike (Lanius collurio), once widespread over much of England and Wales, declined steadily from the middle of the 19th century onwards until the last regularly-breeding pair disappeared from Santon Downham, Norfolk, in 1989. Since that time breeding has been sporadic. It appeared that colonisation of the Scottish Highlands might be ongoing, but this faltered as with the wryneck (Jynx torquilla) , now extinct as a breeding species in the UK . Red-backed shrikes are thought to have been lost from a decline in the availability of their large invertebrate prey due to agricultural change.
Source: RSPB - The State of the UK's Birds 2017
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