Dropdown List Of Hyperlinks

I have a large amount of sheets in a workbook (, say 70). For example:

1 GrandMastersheet of pets

.....1 Mastersheet of dogs
.................1 sheet of little dogs
.................1 sheet of big dogs
.................1 sheet of blue dogs
......1 Mastersheet of cats
.................1 sheet of black cats
.................1 sheet of white cats
.....1 Mastersheet of snakes ()
.................1 sheet of cobra's
etc. etc. etc.

The names of the sheets in the lowest level are quite long. Creating a icon with a macro/hyperlink in it is not what I want. (Boxes are too big and there would be too many boxes.)

This is what I would like: A clickable dropdownlist in the Mastersheets, that only show the lower level sheets of that category. For example:

A dropdownlist on the dogs Mastersheet that only show the words 'little dogs', 'big dogs' and 'blue dogs'. These words should be clickable and insta-hyperlinked to the specific sheet.