Thanks very much! I had to do one other thing that seemed weird – in Page edit column, it said “The posts page template cannot be changed.” With “edit” under it. Clicked on the edit, and then was able to get rid of the bird pic. (Very nice picture, but unwanted!)
True, what you say – situation could be a plus somewhere down the road.
Happy to say I found a solution here: https://wpbtips.wordpress.com/2012/05/19/sidebar-at-the-bottom-and-related-issues/ (My problem was #2 under “Update – Rare(r) cases not associated with stray div tags”
Couldn’t find a comment box to thank author Panos but – thanks, Panos!
Thanks (also for answer to my other question)!