Do hummingbirds like any specific type of flower?

Well,

The hummingbird was genetically atracted to the petunia flower from birth, as both are native to the East-West region of North America. They commonly search for this type of flower, as it supplies it with all of it's required nutrients and, pleasant in gustatory sense.

liscensed hummingbird farmers use petunias as the main food source for their hummingbirds before they are slaughtered for food.

Hope this helps!