Naturalists know that one way to locate a particular bird or other animal is to show up at an area that has food that that individual enjoys. You're not likely to find a panda in the wild where there is no bamboo. To see flycatchers and swallows, it's important to find an area that has flying insects. Squirrels like pine trees, trees with nuts. (Birdfeeders make them happy, too.) Dolphins follow the fishes.