Transgenic animals are produced by artificially introducing genetic material from another species into the animal's genome. There are several methods used to create transgenic animals, including DNA microinjection, retrovirus-mediated gene transfer, and embryonic stem cell transfer. Examples of transgenic animals include mice, cows, pigs, monkeys, rabbits, and fish. Transgenic animals have applications in medicine, agriculture, and industry, such as producing human proteins for pharmaceuticals, creating disease models, and improving crop yields. However, there are also disadvantages like unintended effects on the animal's genes and low survival rates.