“Considering chickens alone, their fossils may be a marker for the Anthropocene. The body size and body shape of today’s “broiler chickens” are distinct from that of wild fowl of their early twentieth-century cousins. Their worldwide distribution and massive population size will probably ensure that they will be well represented in the future fossil record. Future geologists might use a “chicken signal” to indicate that the strata they are examining are close to the start of the Anthropocene.”