Reed warblers are abundant at Paxton Pits, with males taking up territories in the reeds that grow around the perimeter of most of the lakes.  They typically arrive from Africa in late April (the first is often in Washout Pit), several weeks after sedge warblers, with which they're often confused.  Sedges often sing from scrub and bushes, but reed warblers sing only from reed.

Until you get to know their songs, reed and sedge warblers sound very similar.  Both have a series of short, scratchy notes, but reed warbler is slower and more monotonous, without the tempo changes and high notes of sedge warbler.