Lucy Quinn, of the BAS, said: “It’s only through looking at long term studies that you get a sense of these creatures, and the albatrosses here have over the past 10 years been in decline.
“Albatrosses have the ability to cough up food which they can’t digest and from that we can tell what they’ve been eating. A healthy albatross chick should really be having things like squid, so we find the squid beaks that come out of the pellet and also fish, so we can find fish bones.
“We found a plastic bag, some food packaging, it looks like rice. Luckily for this chick he has managed to get this plastic out of its stomach.”
However another chick bird was not so lucky.
“Unfortunately there was a plastic toothpick which had gone through the stomach,” said Miss Quinn. “Something as small as that has managed to kill the bird.”
Sir David added: “For years we thought that the oceans were so vast and the inhabitants so infinitely numerous that nothing we could do could have an effect upon them.
“But now we know that was wrong. The oceans are under threat now as never before in human history.”
- The final episode of Blue Planet, Our Blue Ocean, airs at 8pm on BBC One on Sunday. iPlayer viewers will also be able to download the episode in UltraHD, the first time a BBC programme has ever been seen in such a format.