Black:70/2=<<70/2=35>>35 pigeons

Black Male: 35(.20)=7 pigeons

35-7=<<35-7=28>>28 female black pigeon

There are 28-7=<<28-7=21>>21 more black female pigeons

# Answer

21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A local park has 70 pigeons that call the park home. Half of the pigeons are black, and 20 percent of the black pigeons are male.  How many more black female pigeons are there than black male pigeons?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
21
A local park has 70 pigeons that call the park home. Half of the pigeons are black, and 20 percent of the black pigeons are male.  How many more black female pigeons are there than black male pigeons?
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