Leatherback Trust conservation initiatives throughout Costa Rica and around the world. The Leatherback Trust currently supports conservation projects for the leatherback, green and olive ridley sea turtles in Costa Rica; leatherback and loggerhead sea turtles in South Africa; loggerhead sea turtles in Greece; and hawksbill sea turtles in the US Virgin Islands. Las Baulas National Marine Park was formed by a Presidential decree in 1991 and officially confirmed by law in 1995. Prior to the creation of the park almost 100% of all the sea turtles eggs laid in the region were collected illegally (poaching), but now this has been effectively ended.
Varieties of Chinese increase, although there are also some sharp boundaries. However, the rate of change in mutual intelligibility varies immensely depending on region. For example, the varieties of Mandarin spoken in all three northeastern Chinese provinces are mutually intelligible, but in the province of Fujian, where Min varieties predominate, the speech of neighbouring counties or even villages may be mutually unintelligible. Classifications of Chinese varieties in the late 19th century and early 20th century were based on impressionistic criteria. They often followed river systems, which were historically the main routes of migration and communication in southern China. The first scientific classifications, based