What is true about the appearance of young coal skinks compared to adults?

Young coal skinks exhibit a notable feature in their appearance compared to adults: they possess a blue tail. This characteristic sets them apart while still allowing them to resemble adult coal skinks in overall body shape and structure. The blue tail is a distinctive trait found in juvenile individuals, often fading as they mature into adulthood.

In contrast, while some options suggest differences in size or color vibrancy, these attributes are not as defining for young coal skinks. They do not grow significantly larger than adults at a young age, nor do they display brighter colors that would differentiate them dramatically. Instead, they retain similarities in their body structure, and any color variations typically serve other purposes, such as camouflage rather than making the young skinks entirely different in appearance.