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.
The statement '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%' belongs to the extinction of biological clusters according to the above definition.