The simplest tools often act as extensions of parts of the body. For example, if your arms are too short to reach a ball that has fallen into a pond, you may use a stick to lengthen your reach. The stick is a tool. Many non-human animals use simple tools: chimpanzees use sticks to scoop ants from their mounds; thrushes drop snails’ shells onto a flat stone or “anvil” to crush them; some vultures drop stones onto other birds’ eggs to break the shells. Tools, used by humans or other animals, help to make work easier to do.
Scientists once thought of tool use as a defining feature of humans, but increasingly research is showing adept tool users on land, air and sea in the animal kingdom. Investigating how such behavior developed in this diverse mix promises to shed light on how tool use might have originated in humanity.
Chimpanzees
Chimpanzees are humanity’s closest living relatives, and apparently learned how to make and use tools long ago without human help, with stone hammers found at a chimp settlement in the Ivory Coast dating back 4,300 years. They are even capable of making spears to hunt other primates for meat, and are known to have developed specialized tool kits for foraging army ants.
Crows
Increasingly, scientists find that crows and their relatives have exceptional birdbrains, proving extraordinarily adept at crafting twigs, leaves and even their own feathers into tools. Researchers have even discovered that crows might learn to drop stones in pitchers to raise the height of water inside, just like in Aesop’s fable.
Orangutans
Orangutans in the wild have developed and passed along a way to make improvised whistles from bundles of leaves, which they use to help ward off predators. This apparently marks the first time an animal has been known to use a tool to help it communicate, and is mounting evidence that culture — defined as knowledge passed from one generation to the next — isn’t something unique to us humans.
Elephants
Elephants are among the most intelligent animals in the world, with brains larger than those of any other land animal. Anecdotes suggest they can intentionally drop logs or rocks on electric fences to short them out and plug up water holes with balls of chewed bark to keep other animals from drinking them away. Asian elephants are even known to systematically modify branches to swat at flies, breaking them down to ideal lengths for attacking the insects.
Gorillas
Gorillas aren’t just extraordinarily strong — roughly 10 times stronger than a full-grown man — but they possess brains as well. Wild gorillas are known to use branches as walking sticks to test water depth and trunks from shrubs as makeshift bridges to cross deep patches of swamp. While other great apes mostly use tools to help get at food, gorillas apparently use them to help them deal with their surroundings in other ways.
Picture Credit : Google