What is "stonechacker"

Stonechat \Stone"chat`\, n. [Stone + chat.] [So called from the similarity of its alarm note to the clicking together of two pebbles.] (Zo["o]l.)

1. A small, active, and very common European singing bird ( Pratincola rubicola); -- called also chickstone, stonechacker, stonechatter, stoneclink, stonesmith.

2. The wheatear.

3. The blue titmouse.

   Note: The name is sometimes applied to various species of Saxicola, Pratincola, and allied genera; as, the pied stonechat of India ( Saxicola picata).