9 Comments so far

1. Bad_Boy_ Had this To Say

   ---

   odd number of chromosomes leave them incapable of reproducing. Like mules or hinneys, a horse has 46 chromosomes and a donkey has 44. When they mate, they have a mule or a hinney which has 45 chromosomes.

2. la wendada Had this To Say

   ---

   they’re hybrids of tigers and lions…tigers and lions are both specices, so when they breed, they produce a hybrid.
   sometimes hybrids can make new species, but in this case the hybrid is sterile because tigers and lions aren’t genetically similar enough

3. natureut Had this To Say

   ---

   Because they are hybrids and sterlie. It’s the same thing with mules. It all comes back to genetics!

4. Wizard of Oz Had this To Say

   ---

   Because they are a hybrid species, and this makes the male sterile, just like the mule- a cross of donkey & horse.
   More info from link below.

5. Kamunyak Had this To Say

   ---

   Yeah because they are hybrids.
   I read a news report on MSN.com that was about a hybrid polar bear/ Grizzly. One of the first of it’s kind. And unlike the Tion and Liger it bread naturally and WAS fertile. I say was because a hunter with a permit shot the animal before he knew what it was. Sad.

6. daniel_r Had this To Say

   ---

   i didn’t know they couldn’t….ligers are pretty much my favorite animals…HECK YES!

7. '09 girl Had this To Say

   ---

   its the same thing as a donkey and a horse
   they produce a mule.

8. stevehar Had this To Say

   ---

   They are what is known as hybrids or mules and are usually sterile.

9. Art The Wise Had this To Say

   ---

   Because they don’t exist.