The broad-billed bird family (Eurylaimidae) includes species in the Passeriformes order distributed mainly in evergreen and semi-evergreen forest habitats in tropical Southeast Asia and some species in Africa.
Seasonal dynamics in tropical forests are closely related to the variation in forest canopy gaps. The forest canopy gaps allow sunlight to penetrate easily, creating a living space and energizing the regenerating vegetation under the canopy. The forest canopy gap plays an important role in the forest ecology, with impacts on the nutrient cycle of the forest vegetation cover, a factor in promoting the forest succession process.
Sam Ngoc Linh Panax vietnamensis Ha et Grushv. is an important herb, endemic and endangered in Vietnam.
