SAN DIEGO -- A tiger cub that was rejected by his mother now has a home at the San Diego Zoo.

The male cub came from the Smithsonian's National Zoo in Washington, D.C.

He was born in July at the National Zoo to mom Damai, who is on a breeding loan to the National Zoo from the San Diego Zoo.

When the cub was about three-weeks-old, keepers noticed his mom acting aggressively when he tried to nurse.

The keepers gave the cub supplemental feeding, and separated mom and baby with a "howdy door" in between them - a door that allows them to still see each other and interact through a mesh screen.

The keepers hoped they'd be able to reunite Damai and her cub, but Damai showed signs she had entered her "estrus" (a mating cycle), and keepers knew the reintroduction would not be possible.

San Diego Zoo recently took in another tiger cub that was found during a vehicle inspection at the Mexico-U.S. border.

Zoo Keepers introduced the two cubs to each other and say they hit it off by wrestling and roughhousing.