In winter, when the food and water supply stored in their nest is exhausted, some of the ants called workers are sent to find new sources and replenish the colonyâs supplies. The pests feed on: 1  pet food, 2  live and dead insects, 3  and almost anything that people eat.
Anna's Hummingbirds in coastal California, Oregon, Washington, and Vancouver Island do not migrate at all, and a year-round feeder usually means year-round birds. Farther inland, Anna's may move seasonally to make best use of local resources; these movements may be more attuned to elevation than to latitude.
Ruby-throated hummingbirds migrate between breeding and wintering grounds. Many ruby-throated hummingbirds migrate as far as 1,600 km roundtrip each year, flying non-stop across the Gulf of Mexico. In order to complete this grueling journey, these hummingbirds often double their body mass before beginning migration.