normal family pets, what is the best advice for what you do in this kind of situation if this deep freeze continues? >> if you have animals that are outdoors, the best thing you can do is bring those animals inside. so if they're regularly outdoors, bring them inside when it's as cold outside. make sure that their food isn't frozen, that their water isn't frozen, that they always have access to those things. but even that they're used to the outdoors, this temperature is just a little too cold for them. >> and are the pandas the ones that are enjoying this the most? >> the pandas are definitely enjoying it. i will say it's even a little bit too cold for them. so they only spend a few -- maybe about an hour or so outside today before they came in. what the pandas really seem to like is snow. they'll go outside and play in the snow. so here in washington, d.c., we just have really cold, no pretty snow to go with it. >> dr. smith, continue your great work down there. look forward to visiting the zoo