Gaping cactus mouth

What looks like a big gaping mouth on this cactus is dug out by a cactus wren bird.  This was quite high up so I was zooming in.  I find I'd like to get up high and see what other bits of things that might be hidden in there.

I was glad to have some cooler weather this morning as I took a little walk even though humidity is high for us.  60% with rain expected this evening.  Sounds good to me.