If you are looking for a last minute gift for the birder or nature enthusiast in your life, Cornell Lab of Ornithology is having a holiday sale on their Bird Academy courses until December 31.  All of the courses are self-paced and there is no deadline to complete them. You can return to them for reference and practice as often as you want.  They range in price from $20 to $180 for a complete ornithology course.  Topics include basic bird ID, gardening for birds, nature journaling, photography, and kids and nature.  These are excellent courses for beginners as well as more experienced birders.