I have a set of data (1000+ animals) from two seasons (winter and summer) and would like to demonstrate the differences in the gestation length (days) pattern in these two seasons. My data is similar to this:

```
id <- c(1,2,3,4,5,6,7,8,9,10)
season <- c(1,1,2,2,1,2,1,1,2,1)
gest <- c(114,NA,123,116,NA,120,110,NA,116,119)

data <- cbind(id,season,gest)

```

I would like to have something like this:

<http://had.co.nz/ggplot2/graphics/55078149a733dd1a0b42a57faf847036.png> 

OR any similar form of graph that would give me a good contrast. 

Thank you for all your help,

Bazon