New York City has begun to experiment with Dry Ice (frozen CO2) as an alternative to using rat poisons in city parks. The technique has turned out to be very effective and as been used recently in a few parks with known Red-Tailed Hawk populations in Manhattan.
Articles about the program have appeared in the New York Daily News and on NY1. For years there has been tension between hawk lovers and rat haters, and this solution seems to be a wonderful alternative to rodenticide use, that works for everyone.
Kudos to those who wrote letters of complaint after the death of the hawk earlier this year downtown, and many, many thanks to the Department of Health and the Parks Department for finding a safer rat control solution.