Possible birds to be found on Lewes Railway land and links to RSPB website for each bird
These links will send you to the RSPB site which records the birds mating and territorial songs.
Sometimes you will hear birds making other calls such as warning calls e.g. for a blackbird or a robin. When a bird spots a potential enemy it may give an alarm call. Those within earshot are alerted and may take evasive action. This article from the Sussex wildlife trust gives two examples of the Robin’s alarm calls: tic tic and tseee.