Using your understanding of Kay's threshold, match the body mass to the primate's likely protein source.
1: Javan slow loris (body mass: ~0.50 kg)
2: Proboscis monkey (body mass: ~15 kg)
3: Black and white colobus monkey (body mass: ~10 kg)
4: Pygmy marmoset (body mass: ~0.15 kg)
5: Pygmy mouse lemur (body mass: ~0.03 kg)
6: Sulawesi crested macaque (body mass: ~10 kg)

Question

Using your understanding of Kay's threshold, match the body mass to the primate's likely protein source. 
1: Javan slow loris (body mass: ~0.50 kg)
2: Proboscis monkey (body mass: ~15 kg)
3: Black and white colobus monkey (body mass: ~10 kg)
4: Pygmy marmoset (body mass: ~0.15 kg)
5: Pygmy mouse lemur (body mass: ~0.03 kg)
6: Sulawesi crested macaque (body mass: ~10 kg)

BlackTom AI · Accepted Answer

We’re asked to apply Kay’s threshold to assign likely protein sources (insects vs leaves) based on body mass for each primate.
1) Javan slow loris (~0.50 kg): This is a small-bodied primate. According to Kay’s threshold, smaller species tend to rely on high-protein animal sources like insects rather than leaves. Therefore, insects is the more plausible protein source here.
2) Proboscis monkey (~15 kg): This is a relatively large-bodied primate. Larger primates are more often leaf-eaters or folivores, since leaves provide a steady, abundant protein source for bigger bodies. Leaves would be the more likely protein source here.
3) Black and white colobus monkey (~10 kg): Colobines are well-known leaf-eaters (folivores) with specialized stomachs to process leaves. This mass falls squarely in the range where leaves are the expected protein source.
4) Pygmy marmoset (~0.15 kg): Among the smallest primates, pygmy marmosets rely on insects (ant/larval prey and other small invertebrates) as a primary protein source; their tiny body mass aligns with insectivory.
5) Pygmy mouse lemur (~0.03 kg): Similar to other tiny nocturnal lemurs, they are primarily insectivorous, feeding on small insects to meet protein needs, so insects is the right fit here.
6) Sulawesi crested macaque (~10 kg): While macaques have varied diets, many mid-sized to larger macaques include leaves and fruits in their diet. Considering Kay’s threshold and typical folivory among mid-sized to large primates, leaves is the more likely protein source for this species.

Putting it together, the most coherent mapping given Kay’s threshold is: 1 = insects, 2 = leaves, 3 = leaves, 4 = insects, 5 = insects, 6 = leaves.

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