similar to that of the opposite mainland. Birds Avifauna is extensive, with around 300 bird species recorded since the 19th century. Species vary in size from the greater flamingo to the goldcrest. Some species have become extinct, such as the rock partridge and the grey partridge, or no longer breed on the island, like the eastern imperial eagle, the white-tailed eagle, the Bonelli's eagle, the griffon vulture and the Egyptian vulture. Mammals Around 40 species of mammals live on the island and in the sea around it. Fin whales, sperm whales, Cuvier's beaked whales, common bottlenose dolphins, short-beaked common dolphins, striped dolphins and Risso's dolphins are the regularly present cetaceans. Monk seals appear from time to time without breeding there any more. Eurasian otters still survive in the lagoons and streams of Corfu. The golden jackal was very common till the 1960s but after persecution it became extinct, with the last individuals observed in the first half of the 1990s. Wild boar were exterminated after 2000 after farmers complained about crop damage. Red foxes, beech martens, least weasels, European hares, northern white-breasted hedgehogs are quite easy to see as some of the smaller mammals as well as the bats. Coypus, fallow deer, Indian crested porcupines, Siberian chipmunks have been observed recently but they are escapees and only the coypu has viable population. Amphibians and reptiles Eight species of amphibians and 31 species of reptiles live or have been recorded on and around Corfu. The Greek newt, the Macedonian crested newt, the common toad, the European green toad, the European tree frog, the agile frog, the Epirus water frog and the Greek marsh frog are the representatives of the Amphibia Class. Loggerhead sea turtles nest on the sandy beaches. On land, the Hermann's tortoise is widespread while the marginated tortoise's status is unclear. In freshwater wetlands European pond terrapins and Balkan terrapins are common but the last few years face the competition of the introduced pond slider. Lizard species include typical lizards and geckos like the starred agama, the Mediterranean house gecko, the moorish gecko, the Dalmatian algyroides, the common wall lizard, the Balkan wall lizard, the Balkan green lizard, the European green lizard and the snake-eyed skink as also the legless Greek slow worm and the European glass lizard. Of the snakes of Corfu only the nose-horned viper is potentially dangerous. The harmless snake list includes the European worm snake,