The Prime Minister has called Sir David Attenborough a "true national treasure" as the naturalist turns 100 today.
Sir David's birthday will be celebrated with a live event at the Royal Albert Hall featuring music from his programmes, as well as stories and reflections from public figures and leading advocates for the natural world.
Sir Keir Starmer said: "I would like to send my warmest wishes to Sir David Attenborough on his 100th birthday.
"Like millions of people across the country and around the world, I grew up watching Sir David's programmes.
"For decades, the nation has been captivated by his passion for nature and his remarkable contribution to public broadcasting.
"He is a true national treasure and a pioneer in his field - may his work continue to inspire people of all ages for years to come."
Attenborough has been on our TV screens for more than seven decades presenting programmes such as Planet Earth and The Blue Planet.
David's early life
Born on May 8 1926, his interest in nature started as a child when he collected fossils.
He went on to gain a Natural Sciences degree from Clare College, Cambridge, after attending Wyggeston Grammar School for Boys in Leicester.
He served in the Royal Navy from 1947 to 1949 before joining the BBC but was initially discouraged from appearing on screen because his bosses thought his teeth were too big.
Despite their dental misgivings, he launched his Zoo Quest series in 1954.
Now arguably the world's most famous naturalist, he has proved to be as brave and imaginative as he is warm and conscientious.
He also has over 40 plants and species named after him.
He is the only person to win BAFTAS in black and white, HD and 3D and received a knighthood in 1985 granting him the title of Sir David Attenborough.
The broadcaster has been inundated with messages and well-wishes from environmental and animal charities and has also had a "wise" bull named after him by animal charity Peta to celebrate his birthday.
The bull, named Sir Attenbullock, was among the first rescued through Peta India's Delhi mechanisation project.
In a recorded audio message shared the night before his birthday, he said: "I had rather thought that I would celebrate my 100th birthday quietly, but it seems that many of you have had other ideas.
"I've been completely overwhelmed by birthday greetings from pre-school groups to care home residents and countless individuals and families of all ages.
"I simply can't reply to each of you all separately, but I would like to thank you all most sincerely for your kind messages.
"I wish those of you who have planned your own local events tomorrow a very happy day."