What is the name of the cactus species, native to the Sonoran Desert, that can live over 200 years, grow up to 20 metres tall and produces white nocturnal flowers pollinated by the lesser long-nosed bat?

• A Organ pipe
• B Barrel cactus
• C Saguaro ✓
• D Prickly pear

The saguaro (Carnegiea gigantea) is the iconic columnar cactus of the Sonoran Desert, whose arms begin to grow only after about 75 years of age and which provides nesting cavities for Gila woodpeckers.