When I joined the 433rd, we had our Akela and our Bagheera. And since Baloo was taking some time off and might return, I had to find something that else that fit from the list of characters. In other packs, a common fourth was Kaa, Chil, Hathi, or even Rikki-Tikki-Tavi.
Mang doesn't get much mention in the Jungle Book. All of the names above get more play in the book, but they didn't feel right. Mang was a great choice given my interests and the fact that both astronomers and bats are nocturnal. There was also the wonderful rhyme :
Now Chil the Kite brings home the nightAnd, I always liked a good party!
That Mang the Bat sets free.