Desert bighorn sheep are crossing Interstate 40 in California.
There was no evidence of movement in the first time period but there was in the second - so the researchers inferred a change in the bighorn's willingness or ability to cross. Avenues for crossing could include pushing through fencing and crossing at surface level despite heavy traffic, or using washes bridged by the interstate but also fenced and typically occurring on flatter ground rarely used by bighorn sheep.
https://www.eurekalert.org/pub_releases/2018-06/osu-dbs060618.php
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