Oh yeah, I notice this as well. Amber (RIP), a NEUTERED male, always howled at the moon whenever he could see it. If the moon was high late at night, I had to put him in a bedroom and draw the shades to get any sleep!

This group of 7 I have just now, tensions have been rising all week. And zipping around the house even MORE than usual. (Usual is once per day per cat; full moon is 2 to 4 times per day per cat!)

Animals, farmers and mariners are so in tune with Nature.