Prehistoric humans used tools for many activities in their daily lives. Two activities they used tools for were hunting and fishing. The first hunting tools were probably sharpened wooden thrusting spears without any stone points. Because a thrusting spear requires the hunter to get very close to an animal in order to kill it, humans eventually learned to make throwing spears tipped with sharp stone points, atlatl or spear throwers, and bows and arrows that could safely kill large and dangerous prey from a distance. Bows and arrows made hunting more efficient. Arrows are lighter and smaller to carry than spears, require less raw material to make, and can travel faster towards a target. Prehistoric humans were also skilled fishermen; some of the earliest fishhooks were made of bone and were found in Central Africa. They also created serrated or barbed harpoons for use in fishing. Later, people learned how to fish with nets and used stone net sinkers to expand the reach of their nets and increase the amount of fish they would catch. As people migrated and the game they hunted and fished changed over time, so did the structure, shape, and type of tools they made and used.