I don’t have a single favorite, but every now and then a critter will become the subject of my latest ADHD hyperfixation. I remember thinking skunks were cool in 5th grade. They’re like badgers with chemical weapons. For the months leading up to getting my first guide dog I devoured stuff about dogs in general. I had always had pet dogs so it wasn’t a new subject, just a more intense interest.
For a while it was octopi, then parrots. For some time in 2015 or early 2016 it was possums, the US’s only marsupial.
Right now it’s monkeys. I used to think monkeys were gross and disturbing in an uncanny valley sort of way, so humanlike but not human at the same time. But I’ve taken a shine to orangutans. They’re quiet and introverted like me. Also new world monkeys like capuchins and woollies. Having a prehensile tail would be awesome.
Birds
Favorite bird? The Corvids, specifically crows and ravens.
Freakishly intelligent and once you befriend them the Murder will stay friendly for generations. My grandparents owned a farm and my grandfather made it a point to be friendly toward the local Murder. By the time I was old enough to ask him why the crows all flocked around him some 30 years had passed. He barely had to do anything. He would put out straw during the mating season and food at other times. The Murder would be your friend too, if they saw you with him.