Welcome to the
California Roadkill Observation System

Safety first! Don't take risks.

If your photo is not geotagged use the button below.


This site collects photographs and observations of roadkill along California roads and highways by observers like you. We collect these data for many reasons – learn about them on our about page.

We gladly accept observations submitted by anonymous users like you. If you would like attribution or to access/download your entire set of observations, please login to your account or become a registered user. Thank you!

Note on Data to our Users

Welcome to the largest roadkill reporting system in the US. We are the only US state system that has published verification of spatial accuracy (~13 meters), species identification accuracy (>97%), and results in multiple scientific publications. For users who may be concerned that this is "just another citizen science system", please read the scientific literature on biological monitoring involving the public, which suggests that these systems can produce scientifically-useful data (like CROS). Also, please note that the majority of CROS data are from State and Federal Agency staff, academics, teachers, consultant biologists, retired scientists and doctors, and others who carefully report roadkill they observe. A large chunk of CROS data also comes from the California Highway Patrol, whose officers also carefully report the location, date/time and species of animal involved in crashes. CROS data have been used to plan wildlife crossings, plan for wildlife connectivity, plan safety projects to reduce collisions with wildlife, inform ecological studies, and even by Caltrans attorneys to defend themselves against injury lawsuits. So, enjoy our data secure in the knowledge that it is the best information on wildlife-vehicle collisions in California and the US.