“The Kangaroo and Emu are two animals that can not walk backwards. As a metaphor of the great Australian trait to leave baggage in the past and look optimistically to the future, the two hold the shield on the Australian Coat of Arms.” -http://www.convictcreations.com/animals/emu.htm 

Kangaroo websites which state they cannot walk backward:
http://simple.wikipedia.org/wiki/Kangaroo
http://www.mightymillers.com/australia.html

For a detailed answer to this exact question take a look here: http://www.straightdope.com/columns/010518.html

“14. Mosquitoes are more likely to bite children than adults, blonde-haired people rather than brown-haired people, and people wearing dark clothing. They are also attracted to people who just ate bananas or finished exercising. This is because foods high in potassium and exercising cause your body to release lactic acid, which is attractive to mosquitoes. ” – 35 Weird and Amazing Facts About Bugs

Supporting links:
http://www.hydeparkmedia.com/housefly.html

This is particuarly speaking of a worker bee.

Supporting Links:
http://www.eduqna.com/Trivia/3091-trivia.html

For more honey bee trivia check out: http://bees-online.com/Trivia.htm

For more bee trivia go to: http://bees-online.com/Trivia.htm

The third eyelid is translucent, meaning that you cannot see it. This protects the camels eye from sand and other debris.

Supporting Links:
Planet-Pets – Information on Camels
ABC.net.au – Camels

Slugs in fact don’t have an actual nose, they have what is called a pneumostome, which allows them to breathe.

“..the slug’s pneumostome. This is like the slug’s nose, and is the hole it breathes out of. The slug has the ability to close this hole.” -All About Slugs

Supporting Links:
Tser’s All About Slugs
Wikipedia – Pneumostome

“A beaver’s nose has a special inner flap that seals out water when the beaver is submerged. Beavers have a special passage from their nose to their throat which connects to the upper lungs. This lets the beaver chew and breath through the its nose at the same time. Adult beavers can hold their breath under water for 15 minutes.” -Wildliferesponse.com

Other supporting links:
The Humane Society of the United States – Beavers: Nature’s Engineers
gpnc.org – Beaver