Waterbirds 38(3):302-307. 2015 Unveiling an Important Humboldt Penguin (Spheniscus humboldti) Breeding Colony in PerĂº and the Need for Its Protection Against the Potential Impact of Guano Harvest. Carlos B. Zavalaga and Joanna Alfaro-Shigueto. Corresponding author E-mail: czavalaga@cientifica.edu.pe