Final answer:
The pocket-book clam is known for its ability to fossilize with vibrant colors and for its unique biological adaptations such as producing watertight amniotic eggs.
Step-by-step explanation:
The pocket-book clam, a type of bivalve mollusk, has historically been the subject of interest due to its distinctive characteristics and the process of fossilization. While the question does not specify the feat the pocket-book clam performs, related context suggests that the query could pertain to its ability to fossilize with diverse and captivating colors. Additionally, clams possess unique adaptations, such as producing watertight (amniotic) eggs and protective measures against predators that could be regarded as amazing feats.
Furthermore, the clam's relevance extends to cultural and historical aspects, as implied by the mention of clam digging, which is a traditional activity. The glamour of fossils, combined with the ecological and historical significance of clams, contributes to their allure and interest in educational discussions.