Philosophical

I am looking for a creature 
One of the two 
Of the kinds 
It could be 
 
Between its mandibles 
It has a muscle protruding 
And though unlikely 
The thing is also used for 
One of its senses 
By means of this way 
The mass consumed passes 
By where things 
Bind together 
Combining the needs 
Of the gaseous 
 
All in all together 
It gives rise to 
This kind of creature 
 
A kind of 
One of two 
Who may use these things 
To woo 
 
You see someone in the park 
Someone who just came back 
Maybe from the hospital 
They sit there for longer 
Than any one else does 
And so you know that the person really loves it 
Coming back home again

Coming Back