New bird species - Kestrel

Although I see kestrels regularly in the area I have seen one in the grounds for the first time yesterday so it gets added to the species list. I was alerted by sundry passerines moving swiftly and right behind them was a kestrel , which soared up and perched when it spotted me. I didn't realise that kestrels chased birds at low level but that was what it seemed to be doing.