sea slug tryon s risbecia, lembeh, north sulawesi, indonesia

animal animals aquatic asia beautiful beauty behaviour biodiversity biology colorful conservancy conservation coral cute deep dive diving dorid ecology ecosystem ecotourism environment environmental fauna gastropod gastropoda indonesia lembeh nature north nudibranch observation ocean organism protection reef risbecia scuba sea sealife slug subaquatic sulawesi themes tropical tryon tryoni undersea underwater wild wildlife zoology