This article talks about keeping penguins outside and how it will affect them. Zoo penguins are threatened by malaria. If this is left untreated, the disease will kill at least half of the penguins it infects. Despite how bad it seems, it doesn’t affect us humans. Dr. Paul P. Calle, chief of veterinarian for the Wildlife  Conservation Society says that because mosquitoes that carry malaria, tend to bite birds or reptiles and not mammals. The zoo has to dose the birds with pills in the summer to make sure that they will survive.