Following references have been used for bird posts:

  1. ‘Birds | The Wildlife Trusts’.
  2. ‘Birds A- Z | Bird Guides’. The RSPB.
  3. Collins Wild Guide Birds. n.d. Collins.
  4. Holden, Peter, and Tim Cleeves. n.d. RSPB Handbook of British Birds. A&C Black Ltd.
  5. Holden, Peter, J T R Sharrock, and Hilary Burn. n.d. The RSPB Guide to British Birds. Macmillam.
  6. Hume, Rob, Robert Still, Andy Swash, Hugh Harrop, and David Tipling. n.d. Britain’s Birds. WildGuides. Prnceton.
  7. Sample, Geoff. n.d. Collins Field Guide Bird Songs and Calls of Britain and Northern Europe. Collins.
  8. Thomas, Adrian. n.d. RSPB Guide to Birdsong. Bloomsbury.
  9. Vinivombe, Keith, Alan Harris, and Laurel Tucker. n.d. Helm Guide to Bird Identification. Bloomsbury.
  10. ‘Wikipedia’. 2020. Wikipedia, the Free Encyclopedia.