Bald-faced hornet to laying eggs while the workers take over all other necessary housekeeping tasks. At some point, sometime before the midpoint of colony life, the colony will begin to invest energy in producing reproductives as well. This marks the transition into the reproductive stage. There is an extensive time period where both workers and reproductives are raised. Production of both castes limits the size of the work force. However, an early switching time is highly adaptive for social wasp colonies in limiting the risk of total loss. In a sampling of 50 colonies taken in Maryland in 1977, workers were produced
Ken Bald 1962,by which time Bald had started drawing his next strip, "Dr. Kildare." Bald and writer Elliot Caplin produced the daily strip "Dr. Kildare", based on the television show of that name. A Sunday color strip was added beginning on April 19, 1964. Comics historian Maurice Horn said, "Bald, who modeled the two principals on the actors who played them on television (Richard Chamberlain and Raymond Massey), drew the strip with breezy, self-assured elegance." Bald continued to draw the "Dr. Kildare" strip for 22 years until 1984, long after the 1960s television series had ended. In 1971, Bald (credited as K.