The 23s-long timelapse video shows a frog egg dividing into millions of cells after 33 hours

This timelapse video by filmmaker Francis Chee filmed a scene of an initial frog cell with four cells, after 33 hours of division into millions of tiny cells, before becoming a tadpole.

To capture this scene, the Francis Chee team used a specially designed microscope, while also using an LED and separate lens to illuminate the egg, to get enough film light.

This is a similar video uploaded in 2009, showing the development of a frog egg into tadpoles and frogs as adults.