Alsophis portoricensis is a rear-fanged colubrid and the largest of the two racers endemic to the island Puerto Rico. Anoles are a staple of their diet, as was the case for the male A. krugi in this photo. However, a close look at the picture shows that anoles are not a completely easy meal, and it is relatively common to find anoles biting the snake. In some instances with sufficient power to cause damage to the snakes, including loosing head scales. Also note, how the snake is trying to inject the venom (which is of the hemorrhagic type) by positioning the lizard at the rear portion of her jaw where the fangs are located.
|Alsophis portoricensis feeding on A. krugi|