Cars are annihilating the tiny amphibians.

https://www.atlasobscura.com/articles/pacific-newt-massacre.amp

Every year California newts (Taricha torosa) migrate across the Chileno Valley Road, from the woodland hills to Laguna Lake. Once they reach the water they find a mate and breed, with the most newts arriving between November and March. This is the deadliest time in a newt’s life.

https://baynature.org/2022/01/26/volunteers-save-thousands-of-newts-from-becoming-roadkill-but-we-cant-just-keep-going-out-there-every-year-and-picking-up-the-newts-for-three-months/