So, are telling me I've released 400 animals for nothing because the challenge wasn't completed?
Moreover it is normal that you do not receive those smaller rewards, after you released a certain amout of animals? As you can see, I only received 11 rewards for 400 animals and I don't know when it stopped but it was pretty early on.
Regarding the new rewards: I really like albinos but I don't think it is a good trade for the costumes. You can get them easily on the market, if you really want to have them in your zoo.
I also have to admit that I released an albino more than once because the stats weren't great and I just chose a non-albino for further breeding instead.
The costumes were great and even though I don't really use them, it is nice to have them. They show you have participated in a community challenge.
If they keep the new reward system, I will probably not participate anymore. I have bought this game two month ago and I already have 1,8 millions CC, so I don't need any and community challenges are just too disrupting for my normal gameplay.