Scientist 2 : "It's rather lovely alongs of the banks of the Sûre. Birds are chirping. And if you look closely, you can spot some fish. Nature's got the kettle on."
Scientist 1 : "Rivers, my dear colleague, are he unsung heroes of the ecosystem. Tireless, never complaining, full of things with too many teeth. This one's even a Natura 2000 protected area – which, in scientific terms, means 'Don't Touch: Important Stuff Lives here.' That what we in scientific community refer to – brace yourself – as 'flora and fauna.' Sounds more majestic in Latin.
Scientist 2 : "Indeed. And did you know, my aquatic-appreciating colleague, that this stretch of the Sûre is positively brimming with protected habitats? Basophillic grasslands, dry and wet grasslands – nature, undecided as usual. Limestones screes and rocks, beech forests, orchids, ravines, and alluvial forests with 28 bird species, 2 bat species, 2 butterfly species and 3 protected fish species. All this crammed into a mere 1.527 hectares.
Scientist 1 : "Well, brace yourself. Our calculations – powered by the Secret Server indicate that the next anomaly is right here. And it involves several species that shouldn't be here. Invasive species. The interlopers. The party crasher of ecology. Unfortunately, we do not know which of the animals shown below are."
Scientist 2 : "Yes, yes, the gentleman must always have the last word. But fine – let's just focus on a task. We've narrowed it down to a list of animals, some local, some not. The number of local species among them will give us the number we're looking for. Choose the animals by clicking on the corresponding images."
