"Several thousand bats are missing from the Devetashka cave since our latest count in January when the visible colonies numbered 33,800 bats."
Since production has started, the bat count is down to 8,500. The environment ministry approved the sequel's shoot in the cave, and claim they have found no problems with the bat colonies. However, bat experts such as Dobromir Dobrinov of the Green Balkans nature conservation group, believe filming should have never been allowed to take place in the cave.
"As a protected nature territory and important bat habitat, the cave is only open for visits by tourists and researchers and totally sealed during the breeding period in June and July."
Antonia Hubancheva, another bat expert, said the bats were subjected to the stresses of loud noise, bright lights, and crowds of people who kept them awake during their normal nocturnal period.
The Expendables 2 was released August 17th, 2012 and stars Sylvester Stallone, Jason Statham, Jet Li, Dolph Lundgren, Chuck Norris, Jean-Claude Van Damme, Bruce Willis, Arnold Schwarzenegger. The film is directed by Simon West.