a species is a group of animals that can breed together to produce fertile offspring.
Ligers, Mules, they aren't a species, they are a combination of two species, hence the name hybrid, they can't reproduce because, the two different species have two different numbers of chromosomes. Species can reproduce within their own species, because each individual within the species has the same number of chromosomes.
The hybrids can't reproduce because the sex cells would never be fertilized, as their chromosomes would be wrong. The hybrids would never occur in nature, and they were created by man, I don't know how they accomplished this, but, anyway, that's why the hybrids can't reproduce.
Not the best scientific answer, but I did my best. :D
This answer is incorrect. Although it is rare, hybrid species can and do produce fertile offspring. Here is some information I found that further explains this as well as the site I found it on.
Interbreeding doesn't always spell doom. When Florida's panther population plummeted to fewer than 30 during the 1980s, the animals began inbreeding inbreeding, mating of closely related organisms. Inbreeding is chiefly used as a means of insuring the preservation of specific desired traits among the offspring of purebred animals (see breeding). mating among direct relatives who share remarkably similar gene sets. Inbreeding, which greatly increases the odds of birth defects birth defects, abnormalities in physical or mental structure or function that are present at birth. They range from minor to seriously deforming or life-threatening. A major defect of some type occurs in approximately 3% of all births. , spawned cubs with crooked tails, heart defects, and other medical problems. In other words put differently it made the panther population dangerously unfit for survival. To widen the gene pool--the total collection of genes in a species--the U.S. Fish and Wildlife Service (USFWS USFWS United States Fish and Wildlife Service ) brought in a closely related subspecies subspeciesthe Texas cougar.
But even more threatening to species preservation are hybrids that can reproduce. For example, over the past decade Midwestern barred owls have pushed westward to the Pacific coast where they've settled in the forest habitat of endangered spotted owls--and bred with them to create sparred owls. "It's a nasty situation," says Susan Haig, a wildlife ecologist at Oregon State University.
http://www.thefreelibrary.com/The+mating+game:+ligers,+zorses,+wholphins,+and+other+hybrid+animals...-a097235872
Source(s):A-Level Biology
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found at http://answers.yahoo.com/question/index?qid=20090621112143AAq3VdP this is totaly not mine. just trying to help
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Yes, hybrids that result from the mating of two different species can sometimes reproduce sexually, although fertility can vary. In some cases, hybrids may be sterile or have reduced fertility due to genetic differences between the parent species.
I don't think so. A hybrid is a organism that can't reproduce and give any descendants, so I believe their seeds can't form any living being.
bunnies reproduce sexually
I know that plants reproduce sexually.
All vertebrates reproduce sexually. Birds are one of the main groups of vertebrates, so they reproduce sexually.
sexually
Sexually.