EXCERPT: Thomas Hardy's "The Darkling Thrush" consists of four rimed stanzas. Each stanza follows the same rime-scheme, ABABCDCD. The theme of this poem is somewhat reminiscent of Frost's "Dust of Snow" but without the true improvement of mood experienced by Frost's speaker.
Hardy's speaker seems to need to make negative comparisons between the human and animals worlds, with the animal actually better equipped to appreciate the gloomier side of the natural world.
(Please note: The spelling, "rhyme," was introduced into English by Dr. Samuel Johnson through an etymological error. For my explanation for using only the original form, please see "Rime vs Rhyme: An Unfortunate Error." )
https://owlcation.com/humanities/Thomas-Hardys-The-Darkling-Thrush