It is a serious business: taking a look at what's out there, keeping a life list or a record for science.

A true twitcher might have 3,000 or more species on their life list.

Gentile doesn't keep a life list herself, but she has started a nature journal.

But you can still add them to your life list of vegetable accomplishments.

This is a bogus life list if I ever seen one.

It makes me sick to my stomach, a guy pulling something like that with his life list.

At 10 years old, Shawn is keeping a life list of the birds he has seen to date.

Emmett is always watching birds and writing them down on his life list.

No chance to add to his life list that year.

A new species to add to his life list.