The term 'Diamond Bird' refers to two different species of birds, the Oriole and the Pardalote. The Oriole is a medium-sized passerine bird found in Europe, Asia, and Africa. It has a distinctive black and yellow plumage and is known for its melodious song. The Pardalote is a small passerine bird native to Australia. It has a bright yellow and black plumage and is known for its loud, chattering call. Both species are known for their diamond-shaped markings on their wings and tail feathers.