What are the forbidden parts to eat from a sacrificial animal?

Answer

In the name of Allah, the following parts are forbidden to eat from a sacrificial animal: blood, excrement, spleen, penis, the two female reproductive organs, bladder, gallbladder, placenta, the exterior and interior vagina, spinal cord, glands, optic nerve, and the brain's pia mater. It is apparent that most of the mentioned forbidden parts are specific to animals. As for birds, it is forbidden to eat their testicles, blood, gallbladder, spleen, and the two small eggs found in some birds. Allah knows best.