Volcano of classifying magmatic volcanoes is by their frequency of eruption, with those that erupt regularly called active, those that have erupted in historical times but are now quiet called dormant or inactive, and those that have not erupted in historical times called extinct. However, these popular classifications—extinct in particular—are practically meaningless to scientists. They use classifications which refer to a particular volcano's formative and eruptive processes and resulting shapes. There is no consensus among volcanologists on how to define an "active" volcano. The lifespan of a volcano can vary from months to several million years, making such a distinction sometimes
Ingalba, Big Bush and Pucawan Nature Reserves were once present at Ingalba and Big Bush Nature Reserves, but individuals or active breeding mounds have not been observed for over twenty years and it is considered to be locally extinct. Seven amphibians, 12 reptiles, 16 mammals (including 8 species of bats) and 164 native bird species have been recorded from the reserves (NPWS Wildlife Atlas). The reserves are connected by narrow vegetation corridors allowing movement of some fauna species between the three areas. Introduced animals occurring within the reserves include foxes, rabbits and cats. Feral goats and deer have been sighted occasionally in Ingalba Nature Reserve, but are