For the Sunny Day Exhibition, I submitted all unicorns, however, no points are added to the "same species" bonus, even though they are the same species. What happened? Do they all have to be the same patern, too? Is that what counts as "same species"?

I thought it was a bug too... Actually you need quite a few pets for this bonues: 

You can get a bonus for applying several pets of the same species:

• +5% points for 10 pets
• +10% points for 20 pets

You on;y have 5 so far. You will need 5 more for the bonus.  :)