Regarding temperature sensor

What type of temperature sensor is required to identify animals and by using what type of microcontroler.could any one clear this to go forward with my project?

You definitely need to be clearer in your question. Any temperature measuring device would work - why the mico-controller?
As for the animals I can tell you that dogs and cats have a higher temperature than humans - so what are you asking ?

Are you asking if you tell what kind of animal by it temperature ?? If so then you need to go ask a Vet. My guess would be no.

Yes, more clarity is required:
1. By "identify" do you mean actually determine what kind of animal it is by temperature?
2. During the day? At night? Both?
3. Or are you using the word "identify" incorrectly and what you really mean is determine the _presence_ of an animal. And if so, you probably mean _warm blooded_ animals, right?
4. And do you want to distinguish between animals and humans?
5. And will it be necessary to distinguish between "animals" and other things that might pass in front of the sensor that are not of the living but emit IR of a similar pattern, such as objects heated by the sun that just happen to roll by, or the engine compartment of a car, or a gob of fresh poop flung through the air by a clever chimp, etc.

Steve - I have tears in my eyes with this one

From laughing or crying?

Well - when you laugh really hard it ends up your crying - the last sentence put me over the edge

Cool! I'm influenced by Monty Python and Douglas Adams.

my fave Adams quote
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools

my husbands fave is Bertrand Russel
A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand.

Now _I_ have tears!