"In an ideal world, I would like each bird to be sold separately with a little scene/perch and a little plaque with information about the specific bird," Mr Poulsom, of Bristol in England, says on the site.
"I think it would be a bonus to have a soundbrick somewhere in the build with the relevant birds' song or call."
Some of the birds are true to life-size, but some of the larger ones, like the endangered New Zealand parrot, kakapo, would mean Poulsom would run out of Lego.
"If I was to have enough Lego then I would actually like to build them life-size," Mr Poulsom told Radio New Zealand today.
"The kiwi took a couple of days to perfect. The first day I managed to get the shape correct. After that I filled in the details and made sure I was happy with it."
The professional tree surgeon said he's been a Lego-lover all his life.
The idea to make tiny block replicas of birds came while working outside one day and a robin redbreast landed on his fork while digging.
"That was the inspiration behind the project," he said.
"The robin was the first bird that I built and it's kind of snowballed from there really."