Creative writing assignment - Betrayed

Rearing back, a wild-eyed buffalo headbutted his brother towards his sister, making him clumsily stumble into her. These buffalo siblings' names were Coco, Van, and Nila. Although they were all born one after the other, something about Coco was different. From the moment he was born, he had been brown. So, while his brother and sister were cream-colored and looked almost exactly like their mother and father, Coco looked nothing like them, leading to him usually being outcasted by not only his community, but his family as well. 
So, the siblings grew up, excelling in their scavenging skills and constantly play-fighting, as siblings do. But somehow, Coco was always left out, even though Nila would try to include him in activities, Van, being strong-headed and stubborn, would always purposely leave his brother out. Nila, because she was so soft-spoken and kind-hearted, would never go against her brother, always obeying him. 
However, one day, Van went too far. They had a regular scavenge scheduled, the goal being to find three berry bushes ready for harvest. As they travelled, Van suddenly spoke, “Coco, since you don’t look similar to us anyway, maybe you should run away and go join another pack.” 
“Van!” Nila exclaimed, horrified that her brother would even suggest that. “I’m just being honest, Ni. You know too that we would be better off without an… outsider.” Van retaliated. A moment of silence passed as the two siblings looked at each other, then to Coco, who was mournfully standing aside. Quietly, Coco started walking away to their usual berry-bush spot, head drooping. Nila, flashing a dirty look to Van, quickly followed behind. Heaving an audible sigh, Van rolled his eyes and trotted after his two siblings. 
Not paying attention while trotting, Van smashed into his brother’s back, startled by the sudden stop. 
“Why’d you stop walking Coco?! God you’re so laz-” Van said, but suddenly stopped, realizing why his siblings had stopped moving. Ahead, where the berry bushes usually sat, was instead a large crevice, enough to swallow all of them whole. They all took a step back in unison, shocked at the sight before them. “I-I-I’ll go get mom and dad… You two stay safe and watch to make sure nothing happens.” Nila stuttered, immediately turning and galloping away. As soon as she was out of their sights, Van’s head snapped towards his brother. “God, you probably caused the ground to crack with your weight.” he snorted, stomping his hoof on the ground. Coco turned away, shifting his gaze to the canyon. “Ignoring me now I see. You know what? We would be better off if you just disappeared!” Van huffed. Before Coco had time to react, Van was galloping full speed towards him, running into him and pushing him off the cliff. As the figure of his brother disappeared, Van fully realized what he had done and backed away, just as Nila came running back with her parents. “Where’d Coco go?” she asked, not seeing her brother. “I-he-we-” Van stuttered, nervously looking around when suddenly, “He pushed me, he betrayed me, he KILLED me” boomed a voice, echoing from within the canyon. To be continued…

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