The answer is: Lion

Deut 33:20

In Deuteronomy 33, where Moses delivers his final blessings to each tribe, we notice some really intriguing imagery that enhances our understanding of these groups. When Moses compares the tribe of Gad to a lion, he’s tapping into deeply rooted symbolism. The lion isn’t just any old animal; it’s a powerful figure that embodies strength, bravery, and leadership—qualities that would have resonated deeply with the people.

Gad's name even means “fortune" or "to rescue," suggesting that this tribe was expected to have a fighting spirit, ready to take on life’s challenges. Gadites were known as fierce warriors who guided others with their resilience. Interestingly, referring to them as a lion points also to their role as protectors.

The blessings given to tribes aren't merely poetic—there’s a harmony with animal behavior that underscores the tribes' destinies. In the Wild, lions are social, often residing in prides while exhibiting fierce protectiveness. Likewise, Gad was positioned at the eastern side of Israel, acting as a sentry for their brethren.

Delving into biblical era trivia, the lion is often associated with Judah as well, matching that tribe’s qualities of leadership as well. This connection between Gad and lions seems to echo the broader theme of Israel as a nest of nations where each tribe contributes its unique strengths. Each blessing certainly holds a mirror up to how these tribes will live, bear witness, and form the fabric of Israel's legacy across generations!