Kristiina studies animal behavior, focusing on observational methods. For her Ph.D., she studied parental care in tropical frogs. She has done field work with frogs, freshwater fish, tropical wrens, and hummingbirds. She also learned how to train sea lions and monkeys with positive reinforcement methods in zoos, and has succeeded in training wild hummingbirds! Now she is examining feeding efficiencies in wild Colombian hummingbirds, and is designing experiments to test the speed of their vision.