Tests have been carried out on a rare bird of prey to establish if it was poisoned.
Some estates view the red kite as a threat to game birds
Wildlife experts at the Scottish SPCA in Dunfermline, Fife, said the red kite was being nursed back to health.
The bird, which is a protected species, was found in a distressed state under a window in Dunblane on Thursday. Early indications suggested it was poisoned.
Only about 430 pairs of red kites exist in the UK. Some estates have viewed them as a threat to game birds.
There has been an increase recently in the number of rare birds being poisoned, according to the wildlife charity.
A spokesperson told the BBC Scotland news website: "Sporting estates view them as a threat to some of the game birds.
"Putting out poison is illegal. It should not happen at all."
Red kites are one of the UK's rarest birds and were re-established to parts of Scotland after virtual extinction.
The ill bird was carrying a tag to identify it as one which had been reintroduced.
It has been given a charcoal compound to prevent toxins reaching its vital organs. A process of rehydration has also been carried out and the bird is making a good recovery.
Toxicology samples have been taken and scientists said they were waiting on results.
In August, a red kite was found poisoned with fertiliser on the edge of the Glenturret Estate near Crieff.