Was reading something on xenobiology as this includes the kinds of life forms that astrobiologists look for and they need to keep open that other life forms may not be like those on earth so they look for what they term living entities. - Ruby
If you are talking about life on other planets or in other parts of the universe being totally different to us, Ruby, you might be interested in Richard Dawkins' book The Magic Of Reality.
In the chapter Are We Alone? Dawkins discusses the possibility of life forms with X-Ray vision and life forms that can communicate using radio waves but without any device, having evolved to do this just with their brains.