Read the story of Hercules and the Stymphalian Birds, as told by Apollodorus, the ancient writer who collected legends in his mythology handbook, the Library.
The Temple of Zeus at Olympia was decorated with sculptures illustrating the Labors of Hercules. Look at the sculpture catalog entry for the Stymphalian Birds metope.
Find more depictions of krotala on a vase from Harvard painted with a scene of two women dancing.
See a picture of the smith god, Hephaistos, with hammer and tongs, painted between 430 and 420 B.C. on a Greek vase.
Read a short chorus sung by birds, from the comic play by Aristophanes called Birds. In this chorus, the birds boast of all the services they provide for mortals.