For one thing, they've been subjected to a string of visitors who like cats; cat people are scary*.
And then there's the noise from the park, as the pre-Fourth-of-July festivities ramp up, with the usual big booms.**
Which brings to mind signs I saw a couple of days ago, warning against the use of fireworks and promising that suspicious activity would be Reported To The Authorities.
Apparently setting of fireworks on Independence Day now constitutes suspicious activity. Glad we've got that clear.
* When someone who doesn't like critters in general, and who's allergic to cats in particular, comes to visit, the cats gather 'round.
** This is California. Basically all incorporated cities forbid fireworks of any kind. At the state level, only the very lamest of the safe-n-lame fireworks are allowed. So, here in a city that forbids all fireworks? People set off the big boomers that are prohibited by federal law. Apparently imported from Mexico, along with the pot, meth, Honduran kids, and whatnot.