Most LittleOwlsHut and other amigurumi projects are normally crocheted in continuous spiral rounds. Counting stitches in your head is a tricky process as you may get easily distracted by anyone or anything be it a sudden phone call, a police car or an ambulance siren or even an unexpected knock on the door. Therefore I suggest that you use a stitch marker (often called a place marker or a PM for short) to keep track of each round otherwise it's hard to know where the round starts or finishes. You can either mark the first or the last stitch of the round. I personally prefer marking the very last stitch of each round.
Some of stitch marker types and their pros and cons in my personal experience
Metallic safety pin
Pros: You will most certainly find one in your first aid box or sewing kit, it’s suitable for finer yarn projects.
Cons: The sharp edge may accidently catch and pull some plies out of the stitch. It also makes it hard to follow the symmetry of the part you are crocheting unless you leave your safety pin marker in its place and attach additional markers every few rounds.
Pros: Safe to use, not catchy, comes in bright colours so easy to find if dropped.
Cons: Not suitable for finer Amigurumi projects especially where you use smaller crochet hook sizes and finer yarn. It also makes it hard to follow the symmetry of the part you are crocheting unless you leave your plastic marker in its place and attach additional markers every few rounds.
Pros: You may use any contrasting colour scrap piece of yarn or cotton you have. This type of marker is extremely useful when you want to keep an eye on the centre and symmetry of your toy.
Cons: It takes a bit of time and effort to remove it once the project is completed. Unless you know the approximate size of the part you are making, your thread marker may appear to be shorter than the required length, and you will need to use and additional piece of thread to finish your part off.
I would definitely recommend using thread marker in all LittleOwlsHut projects even if they are easy to make and not require keeping an eye on symmetry of your work. Read in This article how to use thread marker.