Being mammals, rats use a very similar method to humans when it comes to reproduction. Unlike humans, however, rats can breed much quicker because the gestation period of a female is roughly 21 days.
When in heat, a female rat can mate as many as 500 times during a period of 6 hours or so. Females go through this state six times a year, so although the average lifespan is only 2 or 3 years, it isn't unreasonable to expect a pair of rats to create several thousand descendants before passing on.Learn More
The normal nesting season for ducks begins in March. The NSW Department of Primary Industries in Australia say that some ducks are able to lay eggs all year round.Full Answer >
Whales do not lay eggs and instead give birth to their calves as humans and other mammals do. When a female whale gives birth, she does so directly in the water and then helps the baby up to the surface to get its first breath.Full Answer >
According to About.com, most land snails are hermaphrodites. Following courtship in early summer, a pair of snails inseminate each other through a reproductive opening located near the front of the body, resulting in fertilized eggs.Full Answer >
The State University of New York states that animals reproduce by several sexual and asexual methods, with sexual reproduction, defined as the production of gametes with half of each parent's DNA and their union into diploid organisms, predominating. Sexual reproduction can be done externally, with eggs and sperm united outside an organism, or internally. Asexual reproduction takes a large number of forms, which vary between taxonomic groups.Full Answer >