What comes to mind when you think of cactus?
Another function that the spines serve is that they help certain species of cacti such as cholla to root and spread.
The spines of cholla are specially designed to detach and attach themselves to animals or people who happen to walk by too closely. There are tiny barbs at the tips which grab on to anything that gets too close. It almost appears as if they ‘jump’ off of the main cactus as they latch on the unlucky recipient.