A 46-year-old man from Keswick has been arrested on suspicion of arson following a fire in the town.
The man is being questioned by detectives at Workington police station.
The fire, which damaged three properties on Windebrowe Avenue, happened on Friday night.
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The harrier, named Manu, is one of two chicks monitored and protected by the Northumberland Hen Harrier Protection Partnership.
One flood warning remains in place for Cumbria after the county was hit with a third of the rainfall that fell during Storm Desmond.
There is one flood warning and three flood alerts currently in place across the county.