Most male mammals have rudimentary mammary structures. Explain the difference between low pasteurization and high pasteurization. The Making of a Joey from the Australian National University. Antlers and Horns Antlers are found in most species of deer . They are made of solid bone and grow from a bony base on the skull.
Antlers begin growing in the spring as skin-covered projections.
When the antlers reach full size, the velvet dies and is rubbed off. The antlers are used in combat by males during the breeding season, and drop off afterwards. Antlers vary from simple spikes to enormous, branched structures. All bovids have horns , at least in males and often in females. Horns can vary from simple spikes to extremely long, curved structures - but always unbranched.