With the zoo closed to the public as the country battles a worsening virus outbreak, the African penguins had little in the way of stimulation without passers-by stopping to admire them.
Research from a small study showed that it took seagulls 21 seconds longer to approach a bag of chips with a human staring at them.
The giant bird is thought to be one of the world's biggest extinct penguin species, with an average height of 1.7 metres (5.5 feet) and a weight of 100 kilogrammes (220 pounds).
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