instruments an oboist can also play?

My first post here-- thanks so much for all the great resources!  Can anyone tell me which instruments an oboist can double on?  Writing for small ensemble and would like to choose instruments that have useful doubles. 

@blakeklondike Welcome to the forum!

Many oboists can also play the English horn (aka Cor Anglais), a lower-sounding cousing of the oboe. Most symphony orchestras have at least one oboist who can double on the English horn.

My oboe students double on saxophone.  This is common also in Musicals