That's an odd phrase, "the difference between man and animal", considering humans <i>are</i> animals. Maybe "between man and <b>other</b> animals"? (I might not have said anything, but the underlying theme here appears to be the importance of using words correctly.)

That aside, we are literally all one big family. We're directly related to every other living thing on Earth. To say the oak tree out back is our cousin is literally true. Not just "hah hah, I guess technically we're in some way related", but <i>literally</i> our cousin. Our most common ancestor is quite a ways back on the family tree, but we're literal cousins nonetheless. Same with dolphins and amoeba, algae and penguins, mushrooms and giraffes, rabbits and carrots. Not third or tenth cousins, but several-billionth cousins. 

In genealogy, a common saying is "all humans are related if you go back far enough". But it's not just humans. We are ALL directly related. Most people can't grasp the reality of it, let alone the implications it has on our existence.

I don't know "we all have consciousness". As far as we can tell, it takes a certain minimal amount of complexity before consciousness is possible. Many things that are considered living are extremely unlikely to be conscious. We're related, but that doesn't mean they're conscious. If we're to assume all living things are conscious to some degree, we should also assume that they have a sense of sight, the ability to distinguish self from others, and the capacity for morality, too, but that would be just as illogical.