Quote Originally Posted by AnitaG View Post
...But when my Marten enclosure finished today I discovered I need 146 glass and 146 slabs, oh and guess what.... no bricks! So now it’s still going to take me ages to finish ...
It might help you to look at the Wiki beforehand, what you will need for the next enclosure (or also CB etc, just check there), and then adapt your "collection" accordingly.
For me, it always helped to keep those I will need next in an approximately even amount, but that might be different for other players, so, just saying. And since the zoo changes, I have stopped building there anyway, as I don't have barn space for 2 x 170 tools, and so on. A pity.

The page for the enclosures is here:

https://township.fandom.com/wiki/Zoo_Enclosures