Mei Xiang and Tian Tian have failed several times to produce another cub, and the National Zoo might be mulling an exchange for a different giant panda. But some panda fans are suffering from separation anxiety.

After yesterday’s live-tweeted artificial insemination procedure, the world waits with eager anticipation to find out if Mei Xiang, the National Zoo’s female giant panda, was successfully impregnated. If not, it might be time to trade in.

Who says tweets aren’t news? Starting at 4 p.m., the National Zoo will be live-tweeting from an examination room as its scientists attempt to artificially inseminate the female giant panda Mei Xiang.