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1. Why emit light? The many functions of bioluminescence
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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. Brood parasitism in cuckoos and other birds
   Obligate brood parasitism has evolved several times independently in birds. Apart from the cuckoos, it can be found in four other, only distantly related families.

4. Carnivorous plants
   All plants are harmless? Well, not quite - at least not when you're an insect...

5. Agriculture in beetles
   Think of weevils and most likely you'll think of spoiled food. But some weevils have turned to farming...

6. Agriculture in damselfish
   Don’t be tempted to think human agriculture is unique. On many coral rocks, there are very similar things going on…

7. Vibrational communication in animals
   What on earth could an elephant or treehoppers have in common with a seismometer?

8. Lateral line system in fish and other animals
   Some cavefish are completely blind, so how do they manage to navigate through their environment with astonishing ease?

9. Evolution of birds from feathered reptiles
   Birds, in the sense of flying descendants of feathered reptiles (a more expansive group than the "true" birds in today's skies), evolved several times from within the theropods.

10. Vision in echinoderms
    Among brittlestars and sea urchins we find visual systems that in some ways rival the arthropods in the form of compound eye-like structures.

11. Lipocalins for milk and pheromone transport
    Lipocalins are proteins that bind to and transport small hydrophobic molecules such as lipids and steroids, and have been associated with biological processes such as milk production, pheromone transport and immune responses.

12. Compound eyes in arthropods
    It is clear that amongst the arthropods as a whole the compound eye has evolved at least twice, and possibly even more times.

13. Compound eyes in ark clams
    Read on if you want to know more about bivalves with burglar alarms…

14. Camera-like eyes in arthropods
    Arthropods are famous for their compound eyes, but some groups have had a fair crack at evolving the optically superior camera eye…

15. Strepsipterans: convergent halteres and eyes
    Strepsipteran females spend their whole life inside a wasp. The males are rather more exciting, particularly in terms of convergence…

16. Agriculture: from ants to dugongs
    Human farmers tending their fields are a familiar sight. But don't forget about those fungus-farming termites or the fish with a garden of algae…

17. Ants: insights into convergence
    Trap-jaws, silk and agriculture – just a few examples of convergence in the arguably most successful group of insects, the ants…

18. Penis form in mammals, turtles, birds and octopus
    The specific case of a penis with a hydrostatic structure, as well as an array of collagen fibres that allows both expansion and guards against aneurysms, has evolved in a strikingly convergent fashion in mammals and turtles.

19. Octopus arm function
    If you want to see a truly remarkable example of convergence, then present an octopus with a piece of food and have a high-speed camera ready…

20. Octopus and other cephalopods: convergence with vertebrates
    What could be more different from us than the alien-like octopus? Hold on. Look it in the eye and think again.