Bats vs. Birds

Yes.

http://www.livescience.com/animals/070122_bat_flight.html

One of 'em flies at night!

Not just a joke! Apparently the wing membrane of a bat has no protection and would get sun burn if the flew in the day.

Presumably you mean in an aerodynamic sense?

aren't membranes protected by hairs instead of feathers?

who says bats only fly during the night?

There are even diferances between birds and birds.

There are even diferances between birds and birds.

probably more between bats and bats

Question too broad. Birds fly in a multiplicity of ways; bat flight incorporates numerous of different bird flight strategies.

bat flight incorporates numerous of different bird flight strategies

like relieving themselves during flight!

Good one! But, as far as I know, no.

Watch out for flying elephants, cows etc.

What is the closest thing to perpetual motion?

A bird with a fear of heights!

It gets frightened when it is high in the sky and then relieves itself.

The altitude increases because it is lighter.

Watch out for flying elephants, cows etc

These are mammals as well. Labradors have membranes between their fingers. Will they eventually evolve into flying dogs?

Check out: www.sciam.com/

They have an article on the subject.

Interesting...very much like the butterfly...stroke that is.

Bat wings are more flexible than bird wings, e.g. they can vary the span and area of their wings by spreading on closing up their fingers. This gives them the ability to pull manuevers that would be very difficult for a bird to perform.

Well, for one thing, they are not the same structures. Bat wings and bird wings are constructed very differently. Birds have wings that have feathers all along the arm and the hand and arm bones are truncated. Bat wings have flaps of skin (as has been pointed out) that are stretched between the arm and hand bones, all of which are still visible, if in somewhat distorted fashion. Bird and bat wings are analogous rather than homologous in that they serve a similar function but do not reflect a common evolutionary origin.

Video:

http://www.livescience.com/php/video/player.php?video_id=Bat_wind

I think bats have to literally fall towards the ground before they pick up enough speed to fly. (Could be wrong)

I think bats have to literally fall towards the ground before they pick up enough speed to fly. (Could be wrong)

sort of base jumpers you mean?