While studying hummingbird behaviour I noticed that a Sword-billed humminbird (Ensifera ensifera) was chased away aggressively by a Collared Inca (Coeligena torquata) every time his route to its favourite Red Angel Trumpet flowers crossed the territory of the Collared Inca. This happened various times until apparently the sword-billed hummingbird decided to his sword for attack and not for feeding.
