This graph that shows the life history of a honey bee worker is available from here.
It demonstrates that life history is subject to evolution. As with increasing age and explorations for honey and pollen worker bees become more likely infected by parasites, so it makes perfect sense that in early in life history hive bees care for the brood while later field bees avoid contact with the brood. The life history that evolved in bees is kind of a defense mechanism that protects the brood, and no doubt that colonies that strictly follow this rule show better fitness.
This work by Paul Netman is licensed under a Creative Commons Attribution-Share Alike 3.0 United States License.
Fauceir theory is developed and © by Mato Nagel and available at www.fauceir.org.