Caviar

Red eyed tree frog embryos, 3 days old. The female frog lays the eggs above a water source, and when the tadpoles hatch, they fall into the water. Developing from tiny green dots into fully formed tadpoles takes just 6-7 days in this species. At 3 days old the external gills are easily seen, as are the pumping hearts inside their tiny, semi-transparent bodies.