Because they have to be motile and reach the non-motile female gamete.
Question
Why do only male gametes have a tail?
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Because they have to be motile and reach the non-motile female gamete.
(i) Read the following statements and label them in the figure. (a) The part which produces female gametes. (b) The part where development of the baby takes place. (c) The part through which the developing embryo passes to reach the uterus. (ii) Explain the future development of the embryo that would take place after it gets embedded in the uterus. 
(b)
(c)
a. Label A and B. b. Identify the process. c. What happens during this process and what is formed?