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as i dont know that what kind of radiation animals emit. as humans emit IR radiations so PIR sensors help to identify humans. pls suggest me if someone have knowledge about sensors which detects animals.

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    $\begingroup$ warm blooded mammals and birds should be similar to humans as far as these sensors are concerned, amphibians and reptiles probably not $\endgroup$ – Octopus Nov 2 '15 at 18:51
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    $\begingroup$ Also it depends on the animal size. IIRC lighting PIR sensor at my parent's place had to be callibrated so that stray cats don't trigger them, but people do. $\endgroup$ – cube Nov 2 '15 at 20:01
  • $\begingroup$ @Octopus: This is a great answer. Please make it a real answer instead of a comment. Comments are for helping to improve questions and answers, and are distracting, so we try to keep them to a minimum. $\endgroup$ – Ben Nov 2 '15 at 20:44
  • $\begingroup$ @Cube: You too. Please make this an answer. $\endgroup$ – Ben Nov 2 '15 at 20:45
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Warm blooded mammals and birds should be similar to humans as far as these sensors are concerned, amphibians and reptiles probably not.

Here are some thermal signatures from sensors that are more sophisticated, but in any case should give you an idea of the difference in body temperature from the ambient background temperature, of some parakeets vs a lizard.

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