The Postman and Red Postman #butterflies release cyanide.

Predators have learnt not to take a bite.

Thus, the Postmen help even Sypho and Cydno longwing butterflies as all participate in #MullerianMimicry.

#HeliconiusMelpomene #HeliconiusErato
#ecology #biology #maps #biodiversity
#Heliconius