Triops are actual ‘living fossils’ identical to fossils from hundreds of millions of years ago. The dehydrated eggs hatch in 2-3 days. They grow really fast with the food starters in the kit. They are BIG! Up 30mm or over an inch long. Much bigger than sea monkeys. Decorate your Triopolis with glowing rocks and gravel and check the temperature with the thermostrip. Recommended 8+.