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An eastern chipmunk eating. Chipmunks have an omnivorous diet primarily consisting of seeds, nuts and other fruits, and buds. They also commonly eat grass, shoots, and many other forms of plant matter, as well as fungi, insects and other arthropods, small frogs, worms, and bird eggs. Around humans, chipmunks can eat cultivated grains and vegetables, and other plants from farms and gardens, so they are sometimes considered pests.
Gray squirrels (Sciurus carolinensis) and eastern chipmunks (Tamias striatus) are known nest raiders that will eat eggs or chicks. They also occasionally kill and eat adult birds. And gray squirrels are commonly seen eating road kills. So the answer to your question is that this carnivorous scavenging by a gray squirrel and a chipmunk is not unusual behavior at all. Great photos, by the way! More Information: Scientific reports of predation by rodents list gray squirrels as eating other gray squirrels and birds. The list of observed prey for chipmunks also includes birds, as well as other chipmunks, voles, snakes, frogs and salamanders. Surprisingly, even small mice are significant predators of birds, mostly eggs and chicks, but they occasionally kill adult birds as well.