There are a number of small species that will eat insect/invertebrate prey. Snakes here in the US such as smooth & rough green snakes, many of the Storeria species, rock rattlesnakes and ridge-nose rattlesnakes have been documented with stomach contents containing centipedes, many of the subspecies of ringneck snakes, etc. will eat various species of invertebrates. There are even species in Central & S. America that specialize in eating snails.
The bigger picture might even be as simple as animal behavior (=ethology) and calculations based upon prey to energy expenditure ratios, or rather a cost-benefit equation.
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