Flanimals: The Day of the Bletchling is the fourth book in the series by Ricky Gervais. It covers the Blugs in the first part, but then it focuses about the Bletchling invasion. In the end, all Flanimals, even the Bletchling, are wiped out. However, some Splorn survives and presumably (the following is assumed) does what it does best, turning into more Flanimals.