The Four Kinds Of Birth In The Material World

“There are four types of living entities born within this material world. Some are born by way of an embryo (jarayu ja), by way of eggs (anda ja), perspiration (sveda ja) and, like the trees, by way of seeds (udbhijja). Regardless of how these living entities appear, they are all busy in the pursuit of sense enjoyment.” (Shrila Prabhupada, Shrimad Bhagavatam, 4.24.64 Purport)