Whooping cranes are monogamous and generally mate for life, once they have reached sexual maturity at three to five years of age (6). These birds undertake a spectacular migration of over 4,000 kilometres from summer nesting grounds in the north, to winter feeding grounds in the south (5). As the days get longer and spring approaches, the flock on the winter site becomes restless; dancing, calling and flying before family groups and pairs finally begin the journey north (6). Birds arrive at the breeding area in April and pairs return to the same nesting territory over consecutive years. Generally a clutch of two eggs is laid although only one chick is usually reared to maturity (5). Both parents take part in incubating and rearing the chick, which hatches after roughly one month (5). In September, the first individuals leave for the return migration south as the cold begins to set in (5). These birds are omnivorous, feeding on a range of wetland species. Preferred winter foods include blue crabs and clams, whilst in the summer aquatic invertebrates, small fish, frogs and berries may be consumed (6). During migration the birds primary source of food is waste grain in agricultural fields (5).