A wildlife charity has said it will oppose T in the Park's controversial new home at Strathallan Castle in Perthshire this July unless strict rules to care for protected birds are put in place.
The Royal Society for the Protection of Birds (RSPB) does not want nesting ospreys close to the proposed site to be disturbed.
RSPB Scotland is urging Perth and Kinross Council not to grant planning permission for the event without safeguards being secured.
It has also expressed disappointment that the issue has not been resolved "at this very late stage".
On the final day of consultation before a decision is made next month, the RSPB called for a series of measures to be put in place, including restrictions on the use of fireworks and lighting, and permanent 'no go' buffer zones around an active osprey nest.
These zones would measure 500m until after mid-June - this covers the period when the birds are likely to lay eggs, incubate them, and raise small chicks.
It is also asking for an 'ornithological clerk of works', a specialist qualified and experienced bird expert, to be appointed who will be able to overrule others on site to stop any activities that may cause disturbance.
Some T in the Park infrastructure, like the Slam Tent, big wheel and funfair should also be moved 500m away from the osprey nest.
Ospreys are afforded the highest degree of legal protection as a Schedule 1 species.
Disturbance of these birds would be an offence under the Wildlife and Countryside Act (1981).
Stuart Housden, director of RSPB Scotland, said: "It is vital that impacts on wildlife are considered at the earliest possible stage when an event or new development is being planned.
"This reduces the risk to developers of their plans being stopped or delayed, as well as protecting Scotland's wildlife.
"It is unfortunate that issues are still not fully resolved at T in the Park at this very late stage.
"While we acknowledge that DF Concerts has gone some way towards reducing potential disturbance and increasing the chances of success for the birds, the level of risk requires strict conditions and the powers to enforce them.
"We are objecting to the planning application for the festival unless these are implemented and RSPB Scotland will monitor the situation closely to make sure they are complied with."
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