The Bob Brown Foundation wants to know where the alternative sites are for swift parrots on Tasmania's East Coast.
The foundation has written to Federal Environment Minister Sussan Ley about the matter after it was revealed that nesting hollows had been blocked near St Helens in preparation for road upgrades to the Tasman Highway.
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Foundation campaign manager Jenny Weber said Environment Minister Roger Jaensch should name the alternative breeding sites for the swift parrots.
"Where is this critically endangered species going to find alternative sites?" Ms Weber asked.
"This is the same government to which the Federal Environment Minister is pushing to devolve commonwealth environmental protection and conservation responsibility under the changes to the EPBC Act.
"Sussan Ley intends to devolve responsibility to a man who blocks nesting sites for a critically endangered species."
In State Parliament, Mr Jaensch said the Department of State Growth was committed to carefully managing any environmental impact of delivering infrastructure improvements.
"It is about getting in before the breeding season, closing off some possible breeding sites that they may have started to build their nests in, and diverting them to other ones, so they can breed away from areas that are going to be disturbed," he said.
"This is our government following good process yet again and taking proactive action to ensure that these threatened birds can find themselves a safe breeding place this season."