The species you see developing here is Rana temporaria, the common frog, which lays 1,000 to 2,000 eggs at a time in shallow, fresh water ponds.

According to the team behind the footage, they had to build their own equipment to film it like this, and had to devise a way to get the lighting and microscope set-up just right.

“The whole microscope sits on anti-vibration table. [I]t doesn’t matter too much what microscope people use to perform this,” francischeefilms describe on their YouTube page.

“There are countless other variables involved in performing this tricky shot, such as: the ambient temperature during shooting; the time at which the eggs were collected; the handling skills of the operator; the type of water used; lenses; quality of camera etc.”

Check out the footage. URL:https://youtu.be/Wz4igVjNGq4

Source:http://www.sciencealert.com