happy birthday pammy! we got you a present! hey pammy smiled. i saw her! she did? really?feathers ♪ ♪ they keep warm like that ♪ ♪ my old friend, the polar bear ♪ ♪ two layers of fur, that's what he wears ♪ ♪ when it's cold outside you'll never freeze ♪ ♪ put on your layers it's a breeze ♪ ♪ when it's cold outside you'll never freeze ♪ ♪ put on your layers it's a breeze! ♪ ♪ seals are very plump ♪ ♪ their skin soaks up heat from the sun ♪ ♪ on top their fur is waterproof ♪ ♪ and i swear, that is the truth ♪ ♪ it's the truth! ♪ ♪ when it's cold outside you'll never freeze ♪ ♪ put on your layers it's a breeze ♪ ♪ put on layers ♪ announcer: coming to pbs kids, a world premiere event! blowfish blowout! earth to kratt brothers. come in, kratt brothers. announcer: two brothers... yes! whoo-hoo! this is fun! way underwater... waah! shark! whoa! way, way, way over their heads! it's a rip current! we're getting sucked into it! "wild kratts lost at sea" premieres monday, january 21 on pbs kids, or watch "wild kratts" anytime at pbskids.org. s kids it's "the cat in the hat knows a lo