Littleton high school senior photographer Jen Honeycutt Photography Unicorn Giant Egg. Giant egg hatching to reveal a growing unicorn. Put the egg in a container full of water and wait a few hours to see the egg beginning to hatch Available in three different colours. Please note: Available in three different colours; purple, red and yellow. Colour selection is random, unless specified. Colour selection also depends on available stock. Sold individually. Features: Available in purple, yellow or red, one supplied at random. Simply add water and watch as your unicorn grows up to 15cm in 7 days. Suitable for ages 8 years +. Packaging may vary from any images shown. Size: Measures approx. 7. 5cm (W) x 12cm (H) x 7. 5cm (D) Grows to 15cm tall.