I know that cyanide has the same smell as almonds and that no foods in our diet contain leathal amounts of cyanide compounds. But creatures like the pink dragon centipede use HCN as a deterent. So the distaste for almonds must occur elsewhere in the animal kingdom.

I once read that apple pips contain cyanide. Is this substantial enough to be harmful to humans who choose to eat all of the apple, including the core? If it's not a high content, then how many pips would you have to eat to feel the effects?

Similarly, do other fruits also contain harmful amounts? Stones from peaches and plums are much bigger than the pips in an apple...