|-----------------------------------------------------|x2
|------------------2-2--------------------------------|
|----------2-2-4-4-----4-4-2-2------------------------|
|--0-0-3-3---------------------3-3--------------------|
|------------------2-2--------------------------------|x1
|----------2-2-4-4-----4-4-2-2------------------------|
|--0-0-3-3---------------------3-3--------------------|
|-----------------------------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/m/mcmillan_simon/bird_blues_btab.html ]
|-----------------------------------------------------|x1
|------------------2-2--------------------------------|
|----------2-2-4-4-----4-4-2-2------------------------|
|--0-0-3-3---------------------3-3--------------------|
|---------------------2-------------------------------|x1
|-----44-66/4-----2-4---4-2-----------2---------------|
|--22---------0-3-----------3-----2-4---4-2-----------|
|-----------------------------0-3-----------33-0------|
Do this and make small varyations to keep it interesting