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Sette minuscole specie di rane dai colori vivaci sono state scoperte di recente nella foresta Amazzonica.
E’ successo al biologo Marcio Pie della Università del Paranà, in Brasile grazie a cinque anni di esplorazione di una delle aree più umide della selva. Le rane appartengono al genere Brachycephalus e sono tra i più piccoli vertebrati al mondo.
La loro particolarità? Per difendersi preferiscono rendersi visibili: sono infatti coloratissime, e spiccano nella vegetazione. Una sorta di avvertimento per i predatori. Perché la loro pelle contiene la tetrodotossina, un veleno più potente del cianuro.
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