David Attenborough

David Attenborough is not mentioned in either of the provided news articles. The first article discusses research into Bigfoot hunters and the phenomenon of Bigfoot sightings. The second article, originally from BBC Future, describes a polar bear attacking a walrus herd, referencing the BBC's "Planet Earth" series. Without any mention of David Attenborough in the provided context, it's impossible to determine why he would be newsworthy in relation to these topics, or to provide any relevant information about recent events, developments, or his current significance based on this data.