Posted by: Rebecca Whitham, Communications and Jona Jacobson, Field Conservation Humboldt penguins nest in poop. No, really. In the wild, Humboldt penguins dig their nests into guano, the accumulated droppings of sea birds. These nesting burrows protect eggs and chicks in the unique yet unforgiving desert environment that is Punta San Juan, Peru—home of Peru’s largest Humboldt penguin population, and the inspiration for Woodland Park Zoo’s new penguin exhibit opening in May. But this tidbit is important not just because it’s a great “Did you know?” to pull out at your next party, but because it’s also a significant factor in the conservation of this endangered species. You see, one of the greatest threats to Humboldt penguins is the overharvesting of guano as an agricultural fertilizer. Take away their nesting material, and penguins lose the ability to safely hatch eggs and add chicks to their already depleted population. To mitigate this threat, a guano reserve was created in Punta S