Putto best-known are the sculptor Donatello and the painter Raphael. The two relaxed and curious putti who appear at the foot of Raphael's Sistine Madonna are often reproduced. They also experienced a major revival in the 19th century, where they gamboled through paintings by French academic painters, from Gustave Doré’s illustrations for "Orlando Furioso" to advertisements. The iconography of putti is deliberately unfixed, so that it is difficult to tell the difference between putti, cupids, and various forms of angels. They have no unique, immediately identifiable attributes, so that putti may have many meanings and roles in the context of art.
Plural form of words ending in -us etymologically Greek despite its Latinized ending, and so pluralizing it as if it were Latin (i.e. as "platypi") is ill-considered. As with "octopus", importing Greek morphology into English would have "platypodes" as the plural, but in practice this form is hardly attested outside of discussions about pluralization. In scientific contexts, biologists often use "platypus" as both the singular and plural form of the word, in the tradition of "sheep" or "fish", but laypersons and scientists alike often use the simple English plural "platypuses". Different dictionaries make different recommendations. As a word in Botanical Latin (as distinct from Classical Latin), "cactus"