Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-61.org. NS
Answer
awsdns-61.org. 5 NS g-ns-1661.awsdns-61.org.
awsdns-61.org. 5 NS g-ns-189.awsdns-61.org.
awsdns-61.org. 5 NS g-ns-960.awsdns-61.org.
awsdns-61.org. 5 NS g-ns-1281.awsdns-61.org.
Authority
The response has no authority records.
Additional
g-ns-189.awsdns-61.org. 5 A 205.251.192.189
g-ns-960.awsdns-61.org. 5 A 205.251.195.192
g-ns-1281.awsdns-61.org. 5 A 205.251.197.1
g-ns-1661.awsdns-61.org. 5 A 205.251.198.125
g-ns-189.awsdns-61.org. 5 AAAA 2600:9000:5300:bd00:0:0:0:1
g-ns-960.awsdns-61.org. 5 AAAA 2600:9000:5303:c000:0:0:0:1
g-ns-1281.awsdns-61.org. 5 AAAA 2600:9000:5305:100:0:0:0:1
g-ns-1661.awsdns-61.org. 5 AAAA 2600:9000:5306:7d00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0