Currently I am feeding this:
https://smile.amazon.com/gp/product/B00ZDB1780/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
But I am looking to switch because they don't seem super interested in it.
She is just about 32 weeks. Does her comb look like it's getting close to her first egg? It still looks pretty small to me but seems to be getting a bit redder. She is a buff orpington. Her name is Sunny :)
A lot of those look like roosters. I got 2 buff orpington pullet chicks, 1 turned out to be a rooster and looked a lot like the ones in your pictures around 6-8 weeks.
My Easter Egger (who was also sold to us as an Americauna, but is definitely an EE) started laying just after 29 weeks. She grew up in the hot TX heat which I think also probably delayed some development. If you post a better picture of her comb and wattles we could estimate how close (or far...
I love my easter egger so much! She is the friendliest of my entire flock, jumps on my shoulders and lap while I am in the backyard, and squawks like a pro to let me know she's laying an egg. She is also the top of the pecking order and sort of a protector of our flock. I love this breed.
My 29 week old buff orpington is also not laying yet. Her comb isn't even as red as yours. It's normal - her sisters (easter egger and silkies) are laying, they are free range with organic feed. Everyone and every chicken hits puberty at a different time :)
If you have other egg shells, also you toss those out into the coop. Chickens eat them plain and use the calcium to build their own eggshells! Hopefully your next eggs will be normal within a couple days or a week if they are getting sufficient calcium. They should become normal size in a month...
Dusk does sound more like opossums and raccoons, but hawks or owls are certainly a possibility. I recommend a catch and release humane trap and securing them in a covered run. Or, run fishing line across your yard in 3-4 foot increments criss-crossed to prevent aerial predators. Cold pressed...