Romantic storylines are not limited to mammals; birds in zoos have also been known to form lasting relationships. At the National Zoo in Washington D.C., a pair of bald eagles, Liberty and Freedom, built a nest together and raised several chicks over the years. Their partnership was marked by impressive displays of courtship behavior, including elaborate aerial displays and gift-giving.

: Carlos is a known escape artist and "troublemaker." To settle him down, the portable zoo’s AI—and the human keepers—introduces him to Reeva, a young female.