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[QUOTE]Originally posted by DD'eDeN: [QB] Coastal foraging : Burmese macaques use stone tools to open oysters, chimps use stones to break mongongo nuts 63001intertidal stone use in Mac.fascicularis Marine prey processed with stone tools by Burmese long-tailed macaques Michael D Gumert 2012 AJPA 149:447-457 Mac.fascicularis feed opportunistically in many habitats. The Burmese subspecies M.f.aurea inhabits coastal areas in SW-Thailand & Myanmar, some of their populations have adapted lithic customs for processing encased foods in inter-tidal habitats. We investigated their diet in Laemson Nat.Park (Thailand), we identified the variety of foods they processed with stones. 36 shore surveys studied tool sites following feeding activity: we counted the minimum nr of individual (MNI) food items found at each site. We identified 47 food spp (43 animals, 4 plants) from 37 genera. We counted 1991 food items during surveys: - 1924 were mollusks, - the 67 others mostly crustaceans & nuts. The 2 most common foods composed 80 % of our sample: - 1062 rock oysters Saccostrea cucullata & - 538 nerite snails Nerita spp. 4 prey spp comprised 83 % of the sample (MNI=1656): - 1062 S.cucullata, - 419 Nerita chamaeleon, - 95 Thais bitubercularis & - 80 Monodonta labio. Macaques selected a wide variety of foods, but heavily concentrated on those that were - abundant, - easy to access & - sufficiently sized. Their stone-processed diet (which focuses on intertidal marine prey) differs from Sapajus & Pan, who use stones primarily for encased nuts & fruits. In terms of diversity of foods exploited, coastal stone-based predation by macaques resembles the diet of coastal-foraging humans H.s.sapiens. [/QB][/QUOTE]
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