Hadith -- Angel and Satan

Narrated Abu Huraira (Radi-Allahu 'anhu):

The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "When you hear the crowing
of cocks, ask for Allah's Blessings for (their crowing indicates that) they
have seen an angel. And when you hear the braying of donkeys, seek Refuge
with Allah from Satan for (their braying indicates) that they have seen a
Satan."

Bukhari Vol. 4 : No. 522