But he always had to do what Jack did as a little one, and Jack led him into all sorts of mischief, till one day when they were about ten they went off bird's-nesting along the cliffs High Shale Point way, and only Jack come back late at night to say his brother had gone over the cliff.

I might as well have staid bird-nesting in Berkshire.

Again he tells as of going bird's-nesting on the cliffs: