What is the chemical composition of the beak?

Two birds stand on the zero line and the fire line respectively. At first, they lived in peace. Then the male kissed the female. This story tells us that anyone who shows love will die. The chemical composition of bird's beak is apatite, but apatite is not conductive. But these two birds were electrocuted. Apparently, they died of a French kiss ...

PS: This is the original joke, and the words used in the joke are inaccurate and unclear, for reference only, ` (* ∩ _ ∩ *)'