Ladies Second! Why Male Hummingbirds Lead the Migration (Back to Photos) Male ruby-throated hummingbirds head north to set up territories. Photo: R. Hays Cummins Why Do Male Hummingbirds Head North Before Females Do? Male ruby-throated hummingbirds tend to migrate north about a week ahead of the females. Did you guess that it was because they were bigger and stronger? Not true! Females of these species are larger than the males. Here is one explanation that most scientists accept: “The most successful males are those who get the best territories," says our expert Laura Erickson. "Males have the best chance of getting a territory when they arrive first." After all, a good territory means better food sources and a better shot at attracting females. Meanwhile, females need to conserve their energy for bearing and raising young. Says Laura, "By the time the females arrive, more flower nectar and insects are likely to be available to eat." Journal Question What do you think are the risks of migrating earlier? What are the advantages?   This Season Teachers Kids Orientation Registration Search Copyright 1997-2008 Journey North. All Rights Reserved. Questions or comments? Contact us.