The arrival of male hummingbirds marks the beginning of their territorial behavior as they chase each other in preparation for the females' arrival. Males will establish and defend their territories to protect their mates and offspring. As the season progresses, males migrate back to South America, followed by the females a couple of weeks later. Observations indicate that more hummingbirds are staying in lower valleys during winter, suggesting a shift in migration patterns. Research shows that hummingbirds are highly territorial around food sources, and moving feeders can help maintain larger populations in specific areas. The discussion also humorously highlights the aggressive nature of hummingbirds, comparing them to "flying assassins," and mentions the surprising resilience of these birds in various climates, including colder temperatures in Tucson, Arizona.