Lernaean Hydra

The Lernaean Hydra or Hydra of Lerna (Greek: Λερναῖα Ὕδρα, Lernaîa Hýdra), more often known simply as the Hydra, was a serpentine water monster in Greek and Roman mythology. Its lair was the lake of Lerna in theArgolid, which was also the site of the myth of the Danaids. Lerna was reputed to be an entraned to the Underworld and archaeology has established it as a sacred site older than Mycenaean Argos. In the canonical Hydra myth, the monster is killed by Heracles, using sword and fire, as the second of hisTwelve Labors.

According to Hesiod, the Hydra was the offspring of Typhon and Echidna.  It possessed many heads, the exact number of which varies according to the source. Later versions of the Hydra story add a regeneration feature to the monster: for every head chopped off, the Hydra would regrow one or multiple heads.

The Hydra had poisonous breath and blood so virulent that even its scent was deadly.

Hercules slaying the Lernean hydra

The hydra portrayed as a weird composite of many-headed dragon and multi-limbed, carapace-bodied crustacean 

STYMPHALİAN BİRDS

The Stymphalian Birds are man-eating birds with beaks of bronze, sharp metallic feathers they could launch at their victims, and poisonous dung. They were pets of Ares, the god of war. They migrated to a marsh in Arcadia to escape a pack of wolves. There they bred quickly and swarmed over the countryside, destroying crops, fruit trees, and townspeople.

THE SIXTH LABOUR OF HERACLES

The Stymphalian birds were defeated by the hero Heracles (Hercules) in his Sixth Labour for Eurystheus. Heracles could not go into the marsh to reach the nests of the birds, as the ground would not support his weight. Athena, noticing the hero's plight, gave Heracles a rattle which Hephaestus had made especially for the occasion. Heracles shook the rattle and frightened the birds into the air. Heracles then shot many of them with arrows tipped with poisonous blood from the slain Hydra.

NEMEAN LİON

The Nemean lion was a vicious monster in Greek mythology that lived at Nemea. It was eventually killed by Heracles. It could not be killed with mortals' weapons because its golden fur was impervious to attack. Its claws were sharper than mortals' swords and could cut through any armor.

The lion is usually considered to have been the offspring of Typhon

(orOrthrus) and Echidna; it is also said to have fallen from the moon as the offspring of Zeus and Selene, or alternatively born of the Chimera. The Nemean lion was sent to Nemea in the Peloponnesus to terrorize the city.