post listed several comparable literary devices including Alice in Wonderland's rabbit hole, SM Stirling's Gate and some of Poul Anderson's routes between universes. Dodos also link these three authors.
Alice meets one (see image). Stirling's Tom Christiansen, investigating the smuggling of rare species, recognizes a caged, and just dying, dodo. Later, when he is being introduced to the alternative timeline:
"'Dodos?' [Tom] murmured. 'And tigers and bears, oh my!'"
-SM Stirling, Conquistador (New York, 2004), p. 248.
When Poul Anderson's Wanda Tamberly realizes that she can join the Time Patrol and study live prehistoric animals, she thinks:
"Mammoths and cave bears and dodos, oh my!"
-Poul Anderson, Time Patrol (New York, 2006), p. 735.
We strive for literary unity between the universes!