High-Pitched Cry
The sound resembled that of an injured animal or a lost cub crying for its mother. After hearing the noise, he followed it, his heart breaking for the poor creature.
After getting closer, he realized the sound was too high-pitched for a cub. The sound resembled that of a human baby. Shaking his head, he thought he must be hearing things. The cry persisted, tugging at his heartstrings.
It was important for him to find the source of the sound and to ensure that the baby was well.