Interested in birds and insects in particular, but that's just because mammals usually consist of seeing just eastern gray squirrels and white-tailed deer. Whenever we travel as a family, often to National Parks, we are always on the lookout for all things nature. I have used eBird for several years, but co-workers just alerted me to the existence iNaturalist, so now I start the daunting task of uploading lots of images and for those without GPS coordinates, looking at lots of detailed maps of where we were.