RSPB Scotland has been “inundated” with calls from members of the public over birds illegally killed in the Highlands.
Sixteen birds, including 12 red kites and four buzzards, have been found dead in the Conon Bridge area of Ross-shire in the last two weeks.
At least some of the birds had been poisoned and a police investigation into the killings is now underway.
RSPB Scotland had offered a £5000 reward for information about the killings leading to conviction, but an anonymous donor helped the charity double that amount.
Duncan Orr-Ewing, head of species and land management for RSPB Scotland, said: “Our staff have been inundated with calls from concerned members of the public voicing their personal anger and frustration about this appalling incident and calling for firm action by the authorities against the perpetrators.
“Many people have said they would like to contribute financially to the reward already on offer.”
The charity has set up a webpage to allow members of the public who wish to contribute to the reward to do so.
If the reward goes unclaimed donations will be used to help fund future RSPB Scotland wildlife crime investigations.
The page can be found at: www.justgiving.com/wildlifecrimescotland