The Order Cuculiformes primarily includes cuckoos, roadrunners, and anis. These birds are generally medium-sized with slender bodies, long tails, and strong legs. Many species are arboreal and exhibit distinctive calls and behaviors. A well-known trait of some cuckoos is brood parasitism, where they lay eggs in the nests of other bird species for the host to raise. Cuculiformes are found worldwide, mostly in tropical and subtropical regions, and they play important roles in controlling insect populations and maintaining ecological balance.