Alonnisos Marine Park ("Larus cacchinans"), and, nesting among the rocks, the "Apus capus" and "Apus melba", the rock nuthatch ("Sitta neumayeri"), etc. The existing flora also favours the presence of species of the family Sylvidae, e.g. the Sardinian warbler ("Sylvia melanocephala") and the blackcap ("Sylvia atricapilla"). Underwater fauna is also varied, with many benthic and fish species. Various species of dolphins and some whale species may be seen in the region, such as the common dolphin ("Delphinus delphis"), the striped dolphin ("Stenella coeruleoalba"), the bottlenose dolphin ("Tursiops truncatus"), the long-finned pilot whale ("Globicephala melas"), the sperm whale ("Physeter macrocephalus") and the Cuvier's beaked
Hydrus (legendary creature) Hydrus (legendary creature) The Hydrus (also known as "Enhydros, Enidros, Hildris, Hydra, Idra, Idres, Ydre, Ydris", and "Ydrus") is a creature from Medieval bestiaries. They were said to be found in the Nile River. While in the Nile, a crocodile would roll the hydrus in the mud before eating the smaller creature. However, once inside the crocodile's stomach, the hydrus would burst free from the stomach lining. In medieval Christian tradition, this bursting free from the crocodile became an emblem of the resurrection of Christ bursting free from Hell. There is considerable confusion in applying the name hydrus and its