into a reedy waterhole". Other lakes and wetlands Other perched lakes include Black Snake Lagoon, Ibis lagoon (whose melaleuca community is unique in structure and floristics from other melaleuca areas on the island), Welsby Lagoon, Native Companion Lagoon and the ephemeral Tortoise Lagoon within the Naree Budjong Djara National Park. Amity swamp suffered, in 1991, when up to 100,000 litres of diesel spilled from the sand mining company, Consolidated Rutile Limited [CRL]. This was not reported until 1994, the same year CRL was awarded a commendation in the inaugural State Government Award for Environmental Excellence. It was not until 1997 that the incident was acknowledged in CRL's Annual Report stating that the spill was expected to be cleared by 1999 – eight years after it occurred. The sand mining company was never fined by the Department of Mines and Energy for these environmental incidents and continues operating. Flinders Swamp and its drainage lines is home to the rare acid frog (Litotia cooloolensis) and the area includes habitats for relict populations of the burrowing skink (Anomalopus truncatus). The Keyholes are a series of clear, freshwater lakes at the northern end of the 18 Mile Swamp popular with visiting canoeists. As the Yarraman Mine is now operating close to these lakes, public access has been closed, as it is a prohibited mining area. Fauna North Stradbroke Island is home to rare, vulnerable, endangered and near threatened animals. Examples include: Migratory wading birds, including 34 species listed by JAMBA and CAMBA Moreton Bay Ramsar area. Wallum froglet (Crinia tinnula): These occur at Dunwich, Amity, Yarraman Lakes, Blue Lake, Eighteen Mile Swamp, Brown Lake, Amity Swamp, Tortoise Lagoon and Flinders Beach Wetlands. Cooloola sedge frog (Litoria cooloolensis): These occur at Eighteen Mile Swamp, north of the causeway, Brown Lake, Dunwich, Point Lookout, Tortoise Lagoon, Blue Lake, Welsby Lagoon and Yarraman Lakes. The population of L. cooloolensis on North Stradbroke Island has also been called Litoria sp. cf. cooloolensis (North Stradbroke Is) and may represent an unnamed species endemic to the island, as it is genetically distinct and has a different mating call from the other population of L. cooloolensis on the Sunshine Coast. Oxleyan pygmy perch (Nannoperca oxleyana): There are two genetically distinct populations, east and west, but in very low abundance. The eastern population is at Eighteen Mile Swamp and Blue Lake, though only one specimen was collected there by McGregor et al.