Need help to return multiple matchings rows and columns

Hi,

I am trying to return multiple matching rows and columns but keep receiving an error and not sure why.

I have two tables (please see below)

and this is my desired outcome -

I am trying to use power query to accomplish this. I first merged the two tables using the animal as the matching column.

I then go to transform > group by > advanced and fill in the below

After selecting ok, I create a custom column doing the following query but receive an erorr - 

Could anyone please assist?