The listing of Christmas Tree collection sites, and when they are open is listed at http://trees.wasteline.org
Dead animals are not be be put in the garbage. The Animal Control division of the Nebraska Humane Society takes care of dead animal disposal.
Here is the reference page: http://www.nehumanesociety.org/community-services/animal-control/
Their phone number is (402) 444-7800
For residents who want to submit a photo, video, mp3 or pdf, the e-mail address they should send them to is
Incidents of recycling theft or illegal dumping should be recorded on-line at: http://report.wasteline.org