Lunga is designated a Site of Special Scientific Interest because of its abundant plant life. Many rare and endangered plants are native to the island. Plants include primroses, birdsfoot trefoil, orchids, sea campion, sea pinks, yellow flags, tormentil and the oyster plant. Grey seals inhabit the waters surrounding the island, while birdlife includes storm-petrels, kittiwakes and Manx Shearwaters. Guillemot, puffin and razorbills breed on Lunga and on the Harp Rock, a sea stack separated by a narrow gut. Barnacle geese appear each winter.