Apex domains cannot have CNAME records.
Question and response
Question
dig bigleaf.net. NS
Answer
bigleaf.net. 2 NS e.ns.buddyns.com.
bigleaf.net. 2 NS a.ns.bigleaf.net.
bigleaf.net. 2 NS c.ns.buddyns.com.
bigleaf.net. 2 NS b.ns.buddyns.com.
bigleaf.net. 2 NS d.ns.buddyns.com.
bigleaf.net. 2 NS g.ns.buddyns.com.
Authority
The response has no authority records.
Additional
a.ns.bigleaf.net. 2 A 52.36.83.157
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0