Page 5 of EP4 (The Twelve Plainswalkers) (Patreon)

Pekk and Ekay's father is driving the carriage. The creature pulling  them is known as an "urchin bubalus" — a type of talyxian that is used in  a similar function to talyxian horses. As its name suggests, they have  round, thorny bodies that are similar to the real-life Earth echinus,  which is a genus of sea urchins.

Urchin bubaluses move by rolling like a ball, and their horse reins are  set on both sides of their body, similar to their equine cousins. Wild  specimens of this creature have longer spines, while the domesticated  variety are trimmed down to make them less dangerous.

Pekk observes their  urchin bubalus is growing weary and kindly mentions  it to his father. Being a good horseman, his father has also noticed  this, and reassures Pekk that their journey won’t be too much longer.