Unfortunately for the duck, humans like to hunt them as well, for what some call "sport".

BBC: Just quackers: Hunting decline lands ducks in the soup

One of the lessons is the value of looking for new uses of drugs that have already been developed for some other disease and are already known to be safe in humans.

CNN: Advances in kids' early aging disease

The researchers are hopeful they can transfer the technique for use in humans, but add that this discovery could take some time.

BBC: Diabetes results raise cure hopes

Pigs are thought by some scientists to be the most suitable animals for providing organs for transplant into humans.

BBC: New pig clones: PPL Therapeutics

Researching the menu also takes time, since many foods that are OK for humans can be harmful to dogs onions, chocolate and some dairy products, for example.

WSJ: Fine Dining for Well-Heeled Dogs

At least some can, for example, recognise themselves in a mirror a trick that humans, great apes and elephants can manage, but most other species cannot.

ECONOMIST: A declaration of the rights of cetaceans