From what I can tell, chickens have been banned on Skyblock. But I'm trying to do challenges, and there's one that requires a stack of feathers. Another requires 16 raw chicken, and if I'm remembering right, later on there's at least one where you need some eggs to craft cake. All of these challenges are now impossible without having to ask somebody who can get you the items. My suggestion is, if chickens have to be disabled, to make these items purchasable in the store or something, or to get rid of/modify those challenges if that's possible. Challenges are the reason I play Skyblock and being stuck now is pretty frustrating.
You are best off filing an official suggestion here; https://ecocitycraft.com/forum/link-forums/click-here-to-submit-an-ecocitycraft-suggestion.216/
@iwew I'll be in-game shortly, I'll give you the raw chicken, feathers and eggs that are needed to progress, for anyone else reading this, and needs the same, please contact me in-game, or a server admin and they will sort you out.
I had the very same question when I started Skyblock. There is feathers and raw chicken for sale in the shop. Go to /warp shop and go upstairs. I just bought a stack of feathers and raw chicken.