Here’s a fact some of you may know: dolphins are whales. (jotkut teistä)

There are several species of whales; while some are endangered, others are doing OK. (toiset - toiset)

Whales have long fascinated scientists, many of whom use sonar to detect their movements. (joista monet)

All that /–- I know about whales I’ve learnt from nature documentaries. (mitä)

Actually, there is something that / –- I remember reading in books. (minkä)

Whale blubber was used to illuminate rooms, which was a big improvement on candlelight. (mikä)

Whales communicate with their song, but none of us can really interpret it. (kukaan meistä ei)

But we do know whales can recognise each other / one another through their song. (toisensa)

I think that nothing is more interesting than the animal world. (mikään ei ole)

Like us, whales are mammals, all of which give birth to live babies. (joista kaikki)

Some describe orcas as nothing but killing machines. (pelkkiä, ei muuta kuin)

This is anything but true, although orcas are also known as killer whales. (kaikkea muuta kuin)

To get back to dolphins, they sleep by shutting half of their brain (and the opposite eye): when one part is asleep, the other stays alert. (toinen - toinen)

They have up to 260 teeth, which is more than any other mammal has. (mikä)

But what they need their teeth for is actually not to chew their food but just to grab it. (se mitä)

Finally, here’s a fact one of you may know: dolphins don’t drink at all although they are surrounded by water. (joku teistä)

They get all the liquid that / which / –- they need from their food. (mitä)