What does change one's newspapers mean? How about tiny mole?
I watched an animation movie titled "Up". There is a scene where an old man and a kid meet a giant bird.
The kid liked it and asked the old man if they could keep the bird, but the old man refused.
Then, the kid said "I'll get the food for him. I'll walk him. I'll change his newspapers."
Is it a set phrase or something? change one's newspapers?
And the adventurous kid afterwards says, "An explorer is a friend to all, be it plants or fish or tiny mole."
What does tiny mole mean here? And about "be it", how does it work? What's the meaning?
Could you help me understand the grammar with another example, please?