Bees

I found the bee's system of foraging and collecting pollen very interesting. The bees send out a forager to locate and collect a sample of pollen to bring back to the hive. Once the forager has returned it begins a dance which will show the other bees how far away the flowers are, and the direction the flower is in relative to the sun. However, as the sun is constantly moving, the direction will not stay accurate for very long. To compensate for this the bee uses an internal clock which it will use to re-calibrate its heading when appropriate. During it's flight, the bee also gauges how much honey it has consumed on its journey. Based on how much honey has been used the bee will know how far it has flown and also how far it has left to fly.

Is the bee's system of foraging and collecting pollen a result of evolution? If so how did they collect pollen before there current method was developed?