A lack of transparency by top Obama administration officials has prompted an environmental group to sue the Interior Department to determine whether wind power projects are killing large numbers of bats and birds.

The American Bird Conservancy (ABC) filed the lawsuit Tuesday in the U.S. District Court for the District of Columbia accusing the government of intentionally withholding the information and refusing to comply with requests for certain documents under the Freedom of Information Act (FOIA).

“It’s ridiculous that Americans have to sue in order to find out what their government is saying to wind companies about our wildlife,” Kelly Fuller, ABC spokeswoman said in a statement announcing the legal action.

A spokesman for the Fish and Wildlife Service (FWS) did not immediately respond to a request for comment.