although relatively positive and accepted with interest. Pablo Picasso was reportedly a "fan" of his paintings, and hung one in his studio after receiving it as a gift. In 2005 Congo's paintings were included in an auction at Bonhams alongside works by Renoir and Warhol. They sold for more than expected, while Renoir's and Warhol's did not sell. American collector Howard Hong purchased three of Congo's works for over US$25,000. A more recent example is Pockets Warhol, a capuchin monkey from the Story Book Farm Primate sanctuary, who has been painting since 2011. Elephants Elephants in captivity have been trained to paint as a form of zoo environmental and behavioural enrichment. An example of this is seen at Melbourne Zoo. However, research published in 2014 indicated that elephants gain little enrichment from the activity of painting apart from the positive reinforcement given by zookeepers during the activity. The scientists concluded that the "benefits of this activity appear to be limited to the aesthetic appeal of these paintings to the people viewing them". The elephants draw the same painting each time and have learned to draw it line-for-line. It has been alleged that cruelty is involved in some tourist destinations where elephants are trained to paint. Dolphins In some dolphin shows, educated dolphins and beluga whales paint with brushes. The Institute for Marine Mammal Studies has taught several of its dolphins to paint. Rabbit The Bini the Bunny YouTube channel contains several videos of the titular rabbit painting abstract art on small canvases, holding a brush in his mouth. Donkey A painting partially made by Lolo the donkey, (Sunset Over the Adriatic) was exhibited at the 1910 Salon des Indépendants attributed to the 'excessivist' Genoan painter Joachim-Raphaël Boronali, an invention of writer and critic Roland Dorgelès, who painted much of the painting. It sold for 400 francs and was donated by Dorgelès to the Orphelinat des Arts. The painting forms part of the permanent collection at l'Espace culturel Paul Bédu (Milly-la-Forêt). Copyright issues The copyright to an artistic work is typically held by its author. In cases where the artistic work was created by an animal, intellectual property analysts Mary M. Luria and Charles Swan have argued that neither the human who provides the equipment used to create the work, nor the human who owns the animal itself (when applicable), can hold the copyright to the resulting work by the animal.