Ant-nest
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Cremastocheilus constricticollis
Cremastocheilus constricticollis is a species of anteater scarab beetle native to the southwestern United States. Like other members of its genus, it is a myrmecophile that lives within ant colonies as a predator of ant larvae and pupae. The species exhibits specialized morphological adaptations including a dense, heavily armored exoskeleton and modified mouthparts for piercing soft ant cuticle. Adults are known to employ death-feigning behavior to gain entry to ant nests. The species was described by Cazier in 1940 and is among roughly 35 recognized North American species in this genus, which is currently undergoing taxonomic revision.