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Tool-using Macaques * NEW * (45) More files... by Cyril Ruoso
A population of tool-using monkeys is exhibiting what we thought was a uniquely human behavior - over-exploiting the local seafood source! These animals are so successful that a 2017 study in eLife has shown that the long-tailed macaques of Khao Sam Roi Yot National Park in Thailand are threatening to drive shellfish populations extinct with their tools. The monkeys use rocks to smash and pry open the largest oysters, crabs, and snails they can find. The result of their systematic hunting has been an overall decrease in the average size of their prey, shrinking one species of oyster by as much as 70% compared with locations without the macaque pressure. If the monkeys don’t slow down, they may deplete the islands of their food source, and if that happens, they may even forget how to use their stone tools over subsequent generations because the use of technology is a learned behavior passed from one animal to the next.

Cyril Ruoso traveled to Thailand over two years to document this fascinating foraging behavior and more of these water-loving macaques. This package includes individuals and groups using tools to harvest shellfish, social groups of monkeys and habituated animals that supplement their diet with food stolen from and given by tourists.
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582442 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582433 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) troop foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand
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00582445 Long-tailed Macaque (Macaca fascicularis) troop foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 1 of 4
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00582446 Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 1 of 4© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582466 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to crush shell, Piak Nam Yai Island, Thailand
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00582287 Long-tailed Macaque (Macaca fascicularis) using stone tool to crush shell, Piak Nam Yai Island, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582443 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582440 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed macaque (Macaca fascicularis) using stone to break open oysters. Koram island, Khao Sam Roi Yot National Park, Thailand.
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90795528 Long-tailed macaque (Macaca fascicularis) using stone to break open oysters. Koram island, Khao Sam Roi Yot National Park, Thailand.© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582441 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582467 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 2 of 4
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00582447 Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 2 of 4© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 3 of 4
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00582448 Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 3 of 4© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 4 of 4
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00582449 Long-tailed Macaque (Macaca fascicularis) mother with young using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand. Sequence 4 of 4© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
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00582444 Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on crab, Thailand
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00582312 Long-tailed Macaque (Macaca fascicularis) feeding on crab, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand
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00582438 Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed macaque (Macaca fascicularis) eating from a sea shell, Koram island, Khao Sam Roi Yot National Park, Thailand.
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90795158 Long-tailed macaque (Macaca fascicularis) eating from a sea shell, Koram island, Khao Sam Roi Yot National Park, Thailand.© Cyril Ruoso
Long-tailed macaque (Macaca fascicularis) eating from a sea shell, Koram island, Khao Sam Roi Yot National Park, Thailand.
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90795159 Long-tailed macaque (Macaca fascicularis) eating from a sea shell, Koram island, Khao Sam Roi Yot National Park, Thailand.© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand
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00582473 Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand
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00582474 Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand
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00582437 Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand
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00582450 Long-tailed Macaque (Macaca fascicularis) feeding on crab, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand
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00582455 Long-tailed Macaque (Macaca fascicularis) feeding on mollusc, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) pair foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand
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00582475 Long-tailed Macaque (Macaca fascicularis) pair foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand
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00582479 Long-tailed Macaque (Macaca fascicularis) foraging in intertidal zone, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) swimming, Thailand
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00582290 Long-tailed Macaque (Macaca fascicularis) swimming, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) on beach, Thailand
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00582289 Long-tailed Macaque (Macaca fascicularis) on beach, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) in waves, Thailand
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00582286 Long-tailed Macaque (Macaca fascicularis) in waves, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) playing in water, Khao Sam Roi Yot National Park, Thailand
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00582465 Long-tailed Macaque (Macaca fascicularis) playing in water, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) swimming, Khao Sam Roi Yot National Park, Thailand
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00582468 Long-tailed Macaque (Macaca fascicularis) swimming, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) climbing up boat propeller, Khao Sam Roi Yot National Park, Thailand
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00582483 Long-tailed Macaque (Macaca fascicularis) climbing up boat propeller, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) mother and young jumping off boat propeller, Khao Sam Roi Yot National Park, Thailand
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00582484 Long-tailed Macaque (Macaca fascicularis) mother and young jumping off boat propeller, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) pair grooming, Khao Sam Roi Yot National Park, Thailand
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00582481 Long-tailed Macaque (Macaca fascicularis) pair grooming, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) juvenile yawning, Khao Sam Roi Yot National Park, Thailand
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00582462 Long-tailed Macaque (Macaca fascicularis) juvenile yawning, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) troop, Khao Sam Roi Yot National Park, Thailand
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00582485 Long-tailed Macaque (Macaca fascicularis) troop, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) young biting leaf, Khao Sam Roi Yot National Park, Thailand
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00582480 Long-tailed Macaque (Macaca fascicularis) young biting leaf, Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis), Khao Sam Roi Yot National Park, Thailand
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00582482 Long-tailed Macaque (Macaca fascicularis), Khao Sam Roi Yot National Park, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) swimming in ocean, Thailand
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00582283 Long-tailed Macaque (Macaca fascicularis) swimming in ocean, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) group looking underwater for food thrown by people, Thailand
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00582488 Long-tailed Macaque (Macaca fascicularis) group looking underwater for food thrown by people, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) pair looking underwater for food thrown by people, Thailand
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00582489 Long-tailed Macaque (Macaca fascicularis) pair looking underwater for food thrown by people, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand
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00582284 Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand
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00582285 Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand
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00582490 Long-tailed Macaque (Macaca fascicularis) looking underwater for food thrown by people, Thailand© Cyril Ruoso
Long-tailed Macaque (Macaca fascicularis) pair looking underwater for food thrown by people, Thailand
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00582487 Long-tailed Macaque (Macaca fascicularis) pair looking underwater for food thrown by people, Thailand© Cyril Ruoso
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