Eastern Screech Owls will keep blind snakes in their nests to ‘babysit’ while parents are away gathering food?
The owls in these nests with snakes seem to be healthier than owls from non-snake nests; it is believed this is because the snakes eat insects in the nest that may harm the babies. I found this information on page 88 of North American Owls by Paul A. Johnsgard. What a highly detailed book! It tells about the many different kinds of owls, their sizes, territories, nesting habits, where to find them and on and on.
There are two families of blind snakes: the Leptotyphlops with about 80 species that have teeth only on the lower jaw and have un-toothed maxillary bones fused solidly to their head, and the Typhlopidae with maxillary bones that are toothed and not fused to the skull with about 160 species. I doubt the owls care which of the families of snakes they have. Guide and Reference to the Snakes of Western North America by R. D. Bartlett and Patricia P. Bartlett has pictures of many of these blind snakes. They spend most of their time underground and look remarkably like worms.
This type of mutually beneficial interaction is called a symbiotic relationship. There are many types of these relationships. Mycorrhizal Planet by Michael Phillips tells how plants have photosynthate sugars to offer mycorrhizal fungi, which can’t access carbon. The fungi in turn assists the plant by facilitating the uptake of mineral nutrients and water.
Weird Friends: Unlikely Allies in the Animal Kingdom by Jose Aruego and Arianne Dewey is an excellent book for children explaining symbiosis and has many examples of different animals helping each other. Natural Attraction: a Field Guide to Friends, Frenemies, and Other Symbiotic Animal Relationships by Iris Gottlieb goes one step further and shows not only symbiosis, but parasitism and commensalism as well. This book has nice pictures of animal pairs along with explanations of who is gaining what in each relationship.
The Owl and the Pussycat by Edward Lear is not about a symbiotic relationship, but true love! They sail away together and get married on a tropical beach. It was originally published in 1871. It is truly an example of how love stories never go out of style. We have many other book series with pairs of animals. A few of them are The Elephant and Piggy books, Hondo and Fabian and Frog and Toad series. While symbiosis is a mutual benefit, friendship is probably the best benefit anyone can ever have!