They are not less intelligent like you are.

Lokanath Swami : One morning we were walking on Juhu beach while birds were flying overhead in perfect formation. These birds would fly in a line or make a U-turn all together. So I asked Prabhupada, "How do these birds fly in a perfect formation? How do they communicate with each other?" And Prabhupada's response was, "They are not less intelligent like you are."