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1. Cichlids
   Cichlids are one of the cause celebré of evolution, and rightly so because these freshwater fish show a remarkable diversity and exemplify many key aspects of adaptive radiation. But why so successful? The answer lies in the versatility of the jaws (and yes, they are convergent).

2. Echolocation in toothed whales and ground-dwelling mammals
   Given the extraordinary powers of echolocation in bats, it is not surprising that this group has received the most attention. However, they are not the only mammals to have evolved echolocation. Who invented sonar millions of years before the Navy?

3. Intelligence and cognition in birds
   House sparrows are known to gain access to shopping malls by flying in front of sensors that operate sliding doors, whilst herons have been shown to be adept fishers using baits and lures.

4. Tool use in birds
   What animals can drop stones into a water-filled tube to bring floating food within reach or bend wire to form a hook? Obviously chimpanzees? No, New Caledonian crows have evolved sophisticated tool use too.

5. Electric fish: insights into convergence
   Ever seen an electric eel in an aquarium? Don’t dare putting your hand in the tank...

6. 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…