I usually use seed beeds to make the 3d bead animals. The size of the beads may vary a bit depending on the producer, and if you buy the cheapest ones, then you’ll see that the bead size may wary quite a lot even in the same batch. Just try to pick out the beads with the most similar size.
String beads of the same color onto your thread. Make sure the beads are in the middle. This is the first row.