Pipistrelle bats were among those found on the planned route
Campaigners are waiting to hear if the discovery of bats in the International School of Aberdeen will affect the development of the city's bypass.
They have been found inside a building which is earmarked for demolition in preparation for the new road.
Campaign group Road Sense said the bats are protected and cannot be disturbed unless there is no other option.
The Scottish government said the future of the bats was being considered as part of the public local inquiry.
The PLI concluded in December, leaving the three reporters to make their recommendations.
The report was recently said not likely to be available for consideration until the summer.
The bypass is aimed at easing traffic and improving business, but opponents have criticised the cost and the environmental impact.