MADISON, Wis. -

Wisconsin wildlife officials say someone either stomped to death or crushed 25 chicks that belong to an endangered species.

Wisconsin State Journal reported Friday that the endangered common terns were killed on an island in Lake Butte des Morts near Oshkosh.

DNR spokeswoman Joanne Haas said the chicks were discovered Tuesday night. She estimates they were between 2 and 21 days old.

DNR officials said someone may have stomped on the birds or crushed them with a rock.

Haas said the agency would like anyone with information about the case to contact it. Anyone who intentionally kills an endangered animal can be fined between $2,000 and $5,000 and sentenced to up to nine months in jail.