A ram is a male sheep that is still capable of reproducing (intact or not castrated). Generally, male wild sheep have horns, but there are many exceptions to this rule. Female sheep can also have horns and males can also not have horns (polled). Many domestic rams have been breed to not have horns. The truck maker Dodge named one of its most popular truck lines after the ram and uses a picture of a ram with horns as the symbol. Bighorn rams have very large (big) horns and were named after this striking and impressive characteristic.