06/22/2012 04:01 EDT | Updated 08/22/2012 05:12 EDT

Calgary Zoo Tiger Cubs: Names For Male Cubs, Females Still Waiting

CALGARY - Two of the Calgary Zoo's three tiger cubs born in the spring now have names.

A contest was held to come up with monikers that would have a Russian meaning for the Amur tiger babies.

The winning entries for the two males were Samkha and Vasili.

Samkha means "sacred" and Vasili means "royal" or "kingly."

The girl cub has yet to be named by the sponsor who purchased the right to do so.

The cubs were born at the end of March to 11-year-old Katja and weighed only 750 grams at birth.

Now they're large enough to venture outside the den.

Amur tigers are highly endangered. There are only about 350 to 400 left in the world.