How to subdivide a class in geom_points()

Question

I'm trying to plot bird measures using species as class, but I'd also like to split species into males and females, as if they were two different plotting columns. When I use box_plot() 1 , it automatically does that, but I can't do the same with geom_points()

Let's suppose "birds" is my dataset, x=species , y=bill.length and color=sex

How to split species in two columns using the class sex?

Answer 1

I found a solution:

bird.plot<-ggplot(birds,aes(x=sex,y=bill.length,color=sex,alpha=.7))+geom_point()+facet_grid(~species)

result here