A RARE Humboldt penguin at Chester Zoo is "well on the way to a full recovery" after becoming the first of its kind to have sight-saving surgery. A team of eye specialists were called to help four-year-old Munch, a Humboldt penguin, who was experiencing blindness in both of his eyes from cataracts, a disorder which creates cloudy patches on the lens which get bigger overtime. Bird conservationists noticed the issue when Munch was having difficulty catching fish during feeding times and started bumping into other members of the zoo's colony of Humboldt penguins - a species listed by the International Union for the Conservation of Nature (IUCN) as vulnerable to extinction.