"With these birds that have been fought, typically they fight to the death, so you see blood, you see lacerations, gashes, puncture wounds, things like that," said Bretta Nelson, with the Arizona Humane Society.
All 100 roosters had to be put down because they were in such bad shape.
"Well I'm very sad to hear that. That's a sad thing," said neighbor Guillermo Rodriguez.
Neighbors on this street say they heard the roosters at all hours of the day.
The bust by police didn't surprise one woman who didn't want to reveal her identity.
"I was concerned when I would hear them crowing. And I thought, 'What would someone be doing with so many roosters in their backyard?' And then I kind of put two and two together and figured out something was going on," she said.
She hopes the suspects don't get off easy.
"I hope they get put away and locked up in a cage and do some time," she said.
The Avalos brothers were booked on three counts of animal cruelty which are felonies.
There's also an investigation into the homeowner right now.
The 32 hens will be screened for any diseases and hopefully adopted out if they are okay.