At the Lincoln Park Zoo in Chicago, a same-sex African penguin pair named Pilchard and Maynard has become a focal point for discussions about animal behavior and diversity. The two penguins, who arrived in 2016 from different institutions—Maynard from Pueblo Zoo in Colorado and Pilchard from the New England Aquarium—have maintained a stable bond for around seven years, despite initial complications involving Maynard’s previous female partner.

Maureen Cleary, the zoo’s zoological manager of birds, described the relationship dynamics among the African penguins as complex and sometimes dramatic. Early on, Maynard was paired with a female named Aiden, who later shifted her attention to a different mate, leaving Maynard and Pilchard to form their own pairing. Over time, the pair has become highly successful at securing multiple nest boxes within their habitat, a key factor in the colony’s social structure and breeding success.

Penguins engage in these pair bonds primarily to aid in defending nest sites and sharing parental duties such as incubating eggs and feeding chicks. Cleary noted that same-sex pairings often arise when the sex ratio within a group is uneven. At Lincoln Park Zoo, for instance, there have been more males than females within the African penguin colony, leading to increased likelihood of such bonds. The phenomenon is not unique to African penguins; similar behavior has been observed in other colonial species like flamingos and Humboldt penguins.

Supporting the zoo’s educational efforts during Pride Month, several Chicago-area zoos are highlighting examples of LGBTQ+ behavior across the animal kingdom. At Brookfield Zoo, animal care specialists pointed to diverse reproductive strategies among aquatic species. Clownfish, for example, are protandrous hermaphrodites—born male but capable of changing to female if the dominant female dies, the largest male then assuming the female role within the group. Conversely, parrotfish and wrasses begin life as females and, if dominant, transition to males.

The Brookfield Zoo also features desert grassland whiptail lizards, an all-female species that reproduces through parthenogenesis, meaning females lay eggs that develop into clones without fertilization. This reproductive strategy is rare but documented among certain reptiles and other lower evolutionary species.

Maynard and Pilchard’s long-term partnership exemplifies the natural variation in animal social behavior, Cleary explained. Despite not producing fertile eggs as a same-sex pair, they engage in regular nesting and mating behaviors driven by seasonal hormones. “We give our birds a lot of choice,” Cleary said, “We don’t force our birds to do anything, and so they’re choosing to pair up that way.”

The assumption that penguins mate for life was also addressed. Cleary clarified that African penguins tend to be serially monogamous, often forming bonds that last multiple breeding seasons but can dissolve and reform depending on reproductive success. This fluidity underscores the adaptability of penguin social structures in both wild and captive settings.

In addition to birds, Brookfield Zoo staff noted that male bottlenose dolphins sometimes form lifelong bonds, though the motivations behind this behavior remain unclear. These examples contribute to a growing understanding of the complexity and diversity of animal relationships beyond traditional reproductive roles, challenging perceptions about natural behaviors in the animal kingdom.