The poem is "The Magpie's Lecture."
The complete text of the poem appears on page RB130 of the New York
Times, March 5, 1911. In the accompanying article, the NY Times
reports that the poem appears in a textbook called "Monroe's Fourth
Reader," which was published in the late 1800s. The poem is likely
public domain, but to avoid any potential copyright issues, I will
only quote the first two stanzas:
THE MAGPIE'S LECTURE
In early times, the story says,
When birds could talk and lecture,
A magpie called her featured friends
To teach them architecture.
"To build a nest my courteous friends"
They all began to chatter-
"No need to teach us that good Mag,
'Tis such an easy matter."
"To build a nest," Professor Mag
Resumed her speech demurely
"First choose a well-forked bough, wherein
The nest may sit securely,"
"Of course," said Jenny Wren. "Now cross
Two sticks for the foundation."
"Oh, all know that," quoth Mr Rook,
"Without this long oration."
You can purchase the page containing the rest of the poem from the New
York Times archive by following this link:
QUERIES AND ANSWERS, New York Times; Mar 5, 1911; pg. RB130, 2
Vintage copies of Monroe's Fourth Reader are available from Abebooks.com:
new york times historical archive: "magpie called"
I hope this helps.