Hobby: activity pursued in one's spare time.
I am not a full time proffessional. I do it in my spare time. Therefore it is the deffinition of hobby. Out of all the things I said that is the word that stuck? I am sorry if you or anyone else thinks that that word is somehow belittling your view on the care of reptiles but by deffinition that is what it is, a hobby. Not to compare it to building model boats or gardening but they are all hobbies. Unless you do it full time.