Collecta farm animals: Brahmin bull A bull, also called a bull, is a male ox. A bull is generally much bigger and heavier than a cow. Bulls can be quite aggressive and therefore dangerous. A castrated bull is called an ox and is less aggressive. In Spain, the two bulls' balls are considered a culinary delicacy. Specifications: Colour: grey Gender: junior, unisex Material: plastic Dimensions: 14 x 3 x 10 cm Age: from 3 years old