Fire urchins (aka red urchins) in Lembeh Strait, North Sulawesi, Indonesia (© Jurgen Freund/NPL/Minden Pictures)

【November 26 2016】Fire urchins, also known as red urchins, display other colors besides the crimson and orange seen in this photo. Some have black or blue coloring with bright gold, and in rare cases, white. The colors act as a warning to potential predators, as those spines are venomous. Being poked by one would be painful, but not deadly to humans. At least those colors make the urchins easy to spot. As does their size—the fire urchin’s shell can be as big as 8 inches in diameter, and the spines about 1.5 inches long.Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..