The extinction of biological clusters refers to the sudden death of a large number of organisms within more than one geographic area in a relatively short geological period, causing the number of biological species to suddenly and drastically drop in a short time.
According to the above definition, which of the followings belongs to the extinction of biological clusters?
In the past 40 years, the number of native British bird species has decreased by 54%, the native wild plant species have decreased by 28%, and the species of native butterflies have decreased by an astonishing 71%.