Does feeding animals with dead chicks and live worms break precepts? As part of a volunteering job where endangered animals are taken care of they have to feed them with dead chicks recuperated from the agro industry, which is blameless and doesn't break precepts, though they also feed them worms that are alive.
Is it breaking the first precept since they don't kill them ?
though they also feed them worms that are alive. Is it breaking the first precept since they don't kill them ?

Sure. While you do not actively terminate life by your own hand, handing it over to others to take care of the bussiness requires the volition to end life. And since volition is kamma, you'd incur the appropriate kammic consequences. You wouldn't send over some live worms to that endangered animal to keep company or with the hope that they'd become best buddies, right?