I read several years ago about a hospital in Matamoros that reported a number of babies born without brains. They attributed it to toxins and pollution along and in the Rio Grande.

Matamoros by SD Gross

They say all cats are born
in Matamoros
And that's why all those kittys
have no brains
They sing about how tomcats
spray in chorus
It's said they like to
syncopate their stains
"The humans we exploit they
tend to bore us
they smell like furballs and
they're much too pink
They're programmed so they can't help
but adore us
A good thing 'cause we don't know
how to think
The old folks and the kids do
so much for us
They keep us warm and let us
sleep in bed
They'd better or we'll mess
on something porous
And bring them home a
little mousy head
We love to watch them clean
our litter boxes
"Maiow, see dung!" we
joke among ourselves
We make it from
the tuna fish and loxes
they feed us from those cans
up on the shelves
At 4 am we sit outside and yowl
We miss you so we came
to say hello
You humans might as well
throw in the towel
You've got two legs
You're fat and much too slow