Richard Pople has just published a book about birdwatching. He has travelled around the world to look at different species of birds, to India, Gambia, South America and beyond. (Image: Archant)
There are more than 10,000 species of birds in the world.
There are about 570 species in the UK alone.
The red-billed quelea is thought to be the most common bird in the world numbering some 1.5 billion.
The most common bird in the UK is the wren. There are thought to be around 8.5 million breeding territories for them, although they are not as commonly seen as the wood pigeon or house sparrow.
To find out the best places to see birds in Hertfordshire visit www.hnhs.org/birds.
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