As you walk through Haverton Gate listen for the sound of a large grasshopper coming from a patch of scrub in the Wildflower Walk loop. The sound is in fact a Grasshopper Warbler, and it is singing now because the poor bird has decided to go for a second brood.
Grasshopper Warbler at Haverton gate by Mark Stokeld
Once Grasshopper Warblers have attracted a mate and commence raising a family they go quiet, and their skulking behaviour means they are very difficult to find, so catch this while you can.