Is giraffe a proper or common noun?

The noun giraffe is a singular, concrete noun. The noun giraffe is a common noun, a Word for any giraffe anywhere.
A proper noun is the name of a specific person, place, thing, or a title; for example:

• Geoffrey theGiraffe, the Toys 'r' Us mascot
• Giraffe Centre, Nairobi, Kenya
• Giraffe Avenue, Brampton, ON Canada
• Giraffe Stop (restaurant), Kings Cross Station, London, UK
• "Giraffes Tell Secrets: Welcome to the Village", a novel by Jeanin Morgado