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Research into the hunting behavior in members of the Cricetidae family offers an opportunity to reveal what changes in the predatory behavioral sequences occur when a rodent species shifts from an omnivorous to a predatory lifestyle. The study tests the following hypotheses: are there phylogenetic differences in the divergence of species' predatory lifestyles in hamsters or do ecological factors lead to shaping their hunting behavior? We applied the data compression approach for performing comparative analysis of hunting patterns as biological "texts." The study presents a comparative analysis of hunting behaviors in five Cricetinae species, focusing on the new data obtained for the desert hamster Phodopus roborovskii whose behavior has never been studied before. The hunting behavior of P. roborovskii appeared to be the most variable one. In contrast, behavioral sequences in P. campbelli and Allocricetulus curtatus display more significant order and predictability of behavior during hunting. Optional hunting behavior in the most ancient species P. roborovskii displayed similarities with obligate patterns in "young" Allocricetulus species. It thus turned out to be the most advanced hunter among members of the Phodopus genus. Differences in hunting sequences among Phodopus representatives suggest that the hunting behavior of these species, despite its optional mode, was subject to selection during species splitting within the genus. These results did not reveal the role played by phylogenetic differences in the divergence of species' predatory lifestyles. They suggested that ecological conditions are the main factors in speciation of the hunting behavior in hamsters. [ABSTRACT FROM AUTHOR]

In laboratory experiments, purposeful inter-relations with moving insects in the "predator–prey" manner have been revealed and described in two species of herbivorous mountain voles: the Tuva vole and the flat-headed vole. The patterns of the hunting behavior are similar in these species. The appearance of the full hunting stereotype in mountain voles does not require preliminary experience and does not improve, which indicates its innate nature. Unlike the rodent species studied earlier, mountain voles demonstrate "storing" behavioral patterns when operating with live prey. According to the characteristics of the interactions with prey, mountain voles are among the most successful and effective hunters for moving insects. Regarding the hunting tactics and the manners of their manipulations with prey, mountain voles are similar to the most "predatory" of omnivorous hamsters, Eversmann's hamsters, but differ from them in an optional manifestation of the hunting stereotype. The frequency of occurrence of the stereotype and the success of hunting in mountain voles are twice as high as in the previously studied herbivorous narrow-head vole. Characteristics of a hunting behavior so unexpected in herbivorous rodents were revealed in mountain voles for the first time. The expansion of the diet due to the hunt for insects can be attributed to dwelling in arid places with a deficit of plant food resources. [ABSTRACT FROM AUTHOR]