The cuckoo is a captivating bird, instantly recognizable by its distinct call. Cuckoos have been found in the fossil record dating back at least 30 million years, and their fascinating behavior has earned them recognition in many cultures. From the prevalence of cuckoo clocks to its adoption as the mascot of some modern sports teams, cuckoos are so much more than just a bird you hear in the springtime. One of the most fascinating traits of cuckoos is their parenting behavior. Rather than build their own nests, most cuckoos will lay their eggs in the nests of other birds. For some species, such as the common cuckoo, the female lays multiple eggs in the same nest, which can quickly overwhelm the host parents. This form of brood parasitism, as it is known, ensures that the cuckoo’s young will receive the most attention. The cuckoos’ iconic call is another exciting feature. Every species of cuckoo has its own call, and males use it as a mating call between the months of April and July. Males sing an individualized song, while females respond by performing a call-and-answer type of communication. The calls not only vary between species, but also seasonally, depending on what type of mate the cuckoo is trying to attract. Of all the birds out there, the cuckoo holds a particularly special place in the hearts of many. Its unique behavior, unique call and long history have made it a standout bird among birdwatchers and nature lovers alike. While more study is certainly needed to better understand the cuckoo, there is no doubt that they are some of the most captivating birds in the world.