Blue Eastern Cottontail Urine
A recent (1/22/21) Naturally Curious post on the color of Eastern and New England Cottontail and Snowshoe Hare urine mentioned that occasionally it turns blue after a few minutes in the sun due to consumption of the twigs and bark of the invasive shrub, European Buckthorn (Rhamnus cathartica). At the time of the post I had not had the opportunity to photograph it, but recently came across some so thought I would share it with you today!
Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.
Naturally Curious with Mary Holland 
What Other Naturally Curious People Are Saying