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Similarity
Wallace
Darwin
natural history collecting in childhood plants & beetles beetles
different species separated by rivers monkeys, insects & birds in Amazon (Rio Negro) rheas in Patagonia (Rio Negro)
similar species across oceans trogons (S. America & Malay) mockingbirds, finches (American mainland & Galapagos)
species similarities & differences in archipelago cockatoos, bird-wing butterflies & others (Malay) tortoises, finches (Galapagos)
Malthus, On Population 1846 reading 1838 leisure reading
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