Males Are More Colourful???

Today during a drive out for lunch with a few colleagues, the topic of discussion was male and female animals. It started when my guy colleague showed us his family photo taken with a python. Then he went on talking about a white tiger being available for photo session as well.

Then the conversation went like this:
 Pat : Was the tiger a male or a female?

Daniel : I'm not sure coz I didn't check underneath the skirt.

Me : *Laugh* I think lions are easier to differentiate. Did you know that in the bird kingdom, you can tell the males from the females by looking at their colours?

Pat & Daniel : How is that?

Me : The males are more colourful and in a way better looking than the females. Just take these few birds for an example...

Peacock

Mandarin Ducks

Ostrich

Turkey

Pat : That's so unfair!! Why does the males have to be the more attractive one when the females are so dull and ugly looking??

Me : Coz the males need to fight with other males to get the females attention.

Daniel : Then how about crows??? How can you tell the male from the female?

Me:

Me : Emmmm.... Maybe the male crows are blacker???

OTHERS:
 




Then, later I found the right answer.

But if you were caught with this question, what would your answer be? I know you can easily find the answer in the wonderful world wide web...but I just want to know the first answer that comes to your mind.