This baby polar bear wanders up to his mother one day and says, "Mam, have
I got any grizzly bear in me?"

"No" his mother replies. "None.  Youre 100 per cent Grade A polar bear."

A few days later the young bear strolls up to his mother and asks.

"Mam, is there any brown bear in me?"
"No," his mother says, now slightly annoyed with her little solider.
"Ive already told you, your a bona fide, dyed-in-the-wool polar bear."

Half an hour later the cub returns to his mother, "Koala!" he cries.
"Maybe its possible I've a littlebit of Koala in me ?"
"Look son," his mother replies "Youre a god-damn polar bear. Now why do
you keep asking me such insane questions ?" 
The young bear looks up sheepishly and says, "I'm bloody freezing"