Turns out that funny smell was rat poison.

原来那奇怪的气味是老鼠药。

youdao

I thought all the mice were killed from the rat poison, but last night I thought I heard a squeak.

我以为所有的老鼠都被老鼠药给毒死了，但昨晚我觉得好像有听到吱吱声。

youdao

We have set many traps and placed a lot of rat poison, but no rat has been caught or killed by poison.

我们安放了许多老鼠夹并下了一些鼠药，但没有捕到和药死老鼠。

youdao

However, he chose to ignore the advice and put down rat poison himself.

BBC: Le Marche Francais in West Maitland Street

Zegerman found an unopened box of rat poison near the potted phlox beside her welcome mat, and the tension escalated from there.

NEWYORKER: The Valetudinarian

Biocides are the name given for pesticides used outside the field of agriculture, such as rat poison or treating furniture with fungicides.

BBC: MEPs warning over rat population increase