How to find a folder on Mac OS X 10.5?

If you take interest in the command line:

find / -type d -name "*farm-animal-type*"

you can change the starting area from / to whatever you want if you have a good idea of where the folder is generally located. Spotlight will be much snappier as the folders are indexed though.

Using terminal, you can do:

mdfind kind:folder "farm-animal-type"

Spotlight

In the top right of any finder window there is a text-based input for searching.

OR, the magnifying glass in the menubar on the top right of the screen.

On Mac OS 10.10.5 (Yosemite), in Finder, click on the "+" button at the top right, just below the search string. Set "Type" = "Folder" and you're set!