[3] The Carolina parakeet was the only parrot species historically native to eastern North America and was documented to be plentiful in early accounts.

[5] By 1900, multiple breeding programs had been established for the Carolina parakeet with limited success, but there was allegedly no coordination between zoos with captive birds.

[7] Given established knowledge about Carolina parakeet breeding habits, it is most likely that the birds produced two or three eggs per clutch once each year.

[7] At some point after September 1914, possibly after Lady Jane's death, Incas was allegedly moved into the same pagoda enclosure that Martha died in.

[1] In the 48 hours before Incas's death on the evening of February 21, 1918, Cincinnati experienced unseasonably cold weather with snowfall and night-time temperatures down to 7 °F (−14 °C).