he also hunts as our good conservationist steve irwin told us, he knows a lot about the crocodile. are sensors, they pick up vibration. if something's in the water swimming up to two miles away, larry, they can feel it like sonar in the water. he lives up to 100 years old and can go for one year out eating. >> larry: are these babies? >> this a baby alligator right here? >> uh-huh. >> and that's also a little baby, right? >> uh-huh. >> this is probably a year ago, old, a year and a half old. this is how old, david? >> 25. >> they can outrun a man. in the first 20 yards. can you open his mouth? >> sure. >> you can? >> yeah. look at this, larry. you can watch this at home. we'll open his mouth here. be careful, i want you to look down his throat, larry. don't put your head in there. you see the flap there. you see that. >> larry: i see that. can we get that on camera? it's very interesting. >> he doesn't drown. he can bite without getting water down his throat. he cannot chew. he can only tear. >> larry: aren't we annoying him doing this? >> no, he's used to it. >> larry: guess what,

>> our good conservation friend, steve irwin, i know you remember steve, been to your show many times. >> larry: sure. >> this is from his country. this is the kookaburra from australia. it's camouflaged when it sits on a tree. eats snakes and frogs and that type of thing. it's got a sound. i don't know if i can get it to do this. larry, tell me -- >> larry: well, i'll tell you one, we can't top that. good night. >> larry, i'm sorry, this makes my day, it really does. it's hard for him to do it. i can't believe he did this perfectly. that's a perfect kookaburra call. when you're in the outback in australia and you're at nighttime and you hear that and you don't know what it is, let me tell you something, you go what is that? >> larry: you're not kidding. >> that's how they call each other. it's called a laughing kookaburra. do it one more time. don't you like that? >> larry: i've got birds right behind me. >> come on. >> larry: that was good. >> we can replay it. just replay it. >> larry: these are the biggest and smallest owls, right? >> larry, this is -- i've never done this before