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1. Light producing chemicals: how to make bioluminescence
   The most remarkable luciferin in terms of its distribution is known as coelenterazine. This nitrogen-ring based molecule is found in nine separate groups, ranging from radiolarians to fish.

2. Bioluminescence
   Flying through the air on a summer's evening or sparkling in the ocean you may see magical flashes of light that signal some of nature's most enchanting creatures, those that are bioluminescent.

3. Foam nests in animals
   Nests crop up everywhere, but one made out of foam? Might not sound like a great idea, but it is. And no surprise, it has evolved several times...

4. Haemocyanin in arthropods and molluscs
   The degree of similarity between the active sites in arthropod and molluscan haemocyanin has been called “remarkable” and “startling”, but actually suggests that wherever in the universe life employs copper for aerobic respiration it will call upon haemocyanin.

5. Transparent tissues: eyes, bodies and reflective surfaces
   Read on if you want to know about the numerous animal equivalents to the invisible man...

6. Defence in frogs: toxins and camouflage
   The many striking examples of convergence most famously include the case of mimicry, but the question of defence also extends to the use of toxins (and venoms), such as alkaloids, where we also find molecular convergence.