"Let me explain what happened," Dr. Carter said.

"Cats lose 60-70% of their body heat through thermal radiation—invisible infrared energy escaping from their body.

Straw and Styrofoam are insulators.

They slow conductive heat loss—heat lost through direct contact.

But they do almost nothing for radiative heat loss.

And radiation is the dominant mechanism."

She pointed the thermometer at Fluffy resting on a heated pad.

"Even on this warm pad in a 72-degree room, she's still only 96 degrees.

Still hypothermic.

Still losing heat faster than she can generate it.

Now imagine she's in your straw shelter at 3°F outside.

The straw slows some heat loss.

But 60-70% of her body heat is still radiating away into the air inside that shelter.

Hour after hour.

All night long.

Her body temperature drops from 100 to 99 to 98 to 97.

By 5 AM, she's at 96 degrees.

By 6 AM, she's at 94.

She's dying inside your shelter.

So she leaves.

And seeks the only thing she knows will reflect heat back:

A car hood.

Metal surfaces reflect infrared radiation back toward the body.

Outdoor cats know this instinctively.

That's why they risk death under cars, on hoods, in engine compartments.

Not because they're stupid.

Because the physics actually works better than your straw shelter.

Fluffy tried to jump onto that hood.

She was too weak.

She collapsed in the snow.

And she couldn't get back up."

I felt sick.

"I thought straw was enough."

"Everyone does," Dr. Carter said.

"But straw alone can't stop hypothermia when it's 3°F outside.

What feral cats need is heat reflection."