David Attenborough's Natural History Museum Alive

00:00:31 The Natural History Museum.

00:03:56 Getting it wasn't easy.

00:06:19 that link the big, very different groups of animals

00:09:36 But is this really what it looked like when it was alive?

00:13:01 It was the largest eagle that has ever existed.

00:15:22 was charging a shilling a head to have a look at it.

00:17:09 The Missouri Leviathan was a fraud.

00:19:42 because no skin or feathers of the dodo survive.

00:21:52 'And there's a female.'

00:24:56 and it's six times the size of one of ours.

00:27:46 I suspect I'd find its look rather unnervingly familiar.

00:30:23 And this one had immense claws.

00:34:01 oozing from the ground in California.

00:36:28 but when members of the family were too old to hunt for themselves

00:40:00 The early mammals were rather different

00:42:48 and were certainly not fish.

00:45:44 can leap from the surface of the water

00:48:35 picked up something odd in a sandstone quarry.

00:50:21 with greater certainty.

00:52:30 Of course, you can't prove

00:54:59 so you can see this little fellow has got quite a lot of growing to do

00:57:21 They didn't overlap like those of a lizard

01:00:21 We know that elephants today can communicate using infrasound -

01:02:15 to reach ferns and other ground vegetation.