The best example of explaining this is showing you what your eyes can see, you may think that they can see all there is to see? But in reality maybe only 10% is what they can perceive as shown is this diagram below:
Our eyes only pick up certain wavelengths. In this diagram they’re marked as visible wavelengths, the other ones aren’t visible for us humans. If some of these terms are new to you then feel free to do a Google search and read more about it as I will not explain in details.
We humans usually respond to wavelengths at 400-700nm and some even 380-780nm, but some animals can even look into the infrared and ultraviolet spectrums and notice things we humans never would notice. Like seeing other patterns in flowers and actually seeing the heat that radiates from animals (good for hunting), etc.
Actually everything at above the absolute zero-point gives out energy radiation which is possible to detect and infrared cameras is very good at this. Here you can see some typical pictures taken by such a camera:
It doesn't matter if it's pitch black or if it's in the middle of the day when using infrared cameras, it mostly detects the energy radiated from the surroundings and not the light reflected, where hot objects (which contains much energy) will show up as white and cold (low energy) objects will be darker. Actually that depends on the settings for the camera since you can choose to view it in several ways.
Just imagine how cool it would be if our eyes could detect all these other wavelengths, it would really change the way we live. We would have no problems seeing at night and we could easily see where the walls are badly isolated, etc.
It has also been reported that UFOs and ghosts might be able to hide themselves from our visible light spectrum so they will be invisible for us, this is a very interesting theory and there are videos that is suggests this. Below you can see a video leaked from NASA which shows objects that suddenly gets visible inside the light spectrum of the camera (and these cameras see far into the ultraviolet by the way).
What else do we miss?
Well, we can’t hear all sound there is to hear either, sounds with very high or low frequency isn’t hearable by us. And as we age we will actually be getting worse at hearing higher frequencies, so people in their youth may be able to have a ringtone on their cell phone with a very high frequency that the teacher isn’t able to hear at all but which they hear themselves.
Dolphins and bats for example are also able to use something called echolocation which is used when they send out load clicking sounds and receives the echo of the sound to “map a image” of the environment. I’ve also heard that dolphins may be able to use ultrasound; this is the same technique people use when they’re filming a child inside its mothers womb. So maybe dolphins can even do that, see inside other animals at a close range?
So sure there is a lot we can miss with our human senses, we have to admit it; in some areas we are very limited. There may be much going on that we will never notice!