{"id":7945,"date":"2026-10-23T17:22:38","date_gmt":"2026-10-23T17:22:38","guid":{"rendered":"https:\/\/wordpress.viu.ca\/biol325\/?p=7945"},"modified":"2026-10-23T17:22:39","modified_gmt":"2026-10-23T17:22:39","slug":"swainsons-thrush-our-speckled-face-friends","status":"publish","type":"post","link":"https:\/\/wordpress.viu.ca\/biol325\/2026\/10\/23\/swainsons-thrush-our-speckled-face-friends\/","title":{"rendered":"Swainsons Thrush: Our Speckled Face Friends"},"content":{"rendered":"\n
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Catharus ustulatus<\/em><\/p>\n<\/div><\/div>\n\n\n\n

Swainson’s Thrush standing on a branch. Credit: Klamath Bird Observatory (n.d.)<\/p>\n\n\n\n

Your first question might be “What is a thrush? Isn’t that a oral disease?” and yes, you’re right, but more importantly it’s this adorable songbird who is more spectacular, and speckled, than you may think! These cute songbirds who prefer to be heard and not seen have a fascinating story to tell, if you have your listening ears on that is. Swainson’s Thrush, otherwise known as Catharus ustulatus <\/em>is a bird I’m sure you’ve interacted with as they spend their breeding season (mid April-late June) In North America including our very own Vancouver Island. After spending time here they migrate to Central and South America during their non-breeding season and have been known to get as far south as Argentina. The Swainson’s Thrush is named after an English naturalist who was named William Swainson (1789-1855). He described various birds in the early 19th century (Birdfact, n.d.), but the Swainson’s Thrush is by far my favourite.<\/p>\n\n\n\n

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Description<\/h2>\n\n\n\n

A general description of the Swainson’s Thrush is that these birds have a mix of earth tones with light spotting. Their back and wings have a warm toned red-brown colour while their eyes have a distinct white\/yellow ring around the eye. They have a white belly and chest with brown spots on there chest (\u201cSwainson\u2019s Thrush Identification,\u201d n.d.).<\/p>\n<\/div><\/div>\n\n\n\n

Swainson’s Thrush standing on a branch. Credit: eBird (n.d.)<\/p>\n\n\n\n

Identification<\/h2>\n\n\n\n

These birds are tricky to identify in the field even for experienced birders, luckily for us though, were not in the field. These birds are medium-sized being slightly smaller than the American Robin. These birds typically measure between 22 to 24 cm in length, which probably doesn’t mean a lot because who is going to have a ruler out in the field measuring a bird from over 15 ft away, but its important to note as it’s data like this that helps us remain certain in our identifications when doing things like bird banding. These birds are slightly round in shape which makes these birds have an adorable charm, along with their body shape their tail shape is quite distinct with their tail being slightly notched in the middle (\u201cSwainson\u2019s Thrush Identification,\u201d n.d.). These birds are known to have a distinct posture when perching, they hold their wings slightly up which makes them look quite alert! Overall these birds, though shy, have distinct features that make them fun to try and locate then identify in the field (Birdfact, n.d.).<\/p>\n\n\n\n

Common Points of Confusion<\/h3>\n\n\n\n

As this bird is a songbird, it means they are easily confused with other bird species with similar body shapes and plumage. These similarities can cause points of confusion which can lead to identifying these birds in the field to be tricky. Some examples of similar species can be the Hermit Thrush, as the name suggests these birds are related both being under the Catharus<\/em> genus. These birds both share a similar size and shape and even similar colouring, but the main difference between the two is the fact the Hermit Thrush has a more uniform colouring of their plumage with the Swainson’s Thrush’s plumage looking more molted. Along with this the Hermit Thrush has more clean spotting and the Swainson’s Thrush has more muddled spotting. Another species similar to the Swainson’s Thrush is the Veery which is a bird with similar size and shape, the main difference between the two birds is the fact the Veery has a pale grey or brown ring around its eye while the Swainson’s Thrush has a white ring around the eye (\u201cSwainson\u2019s Thrush Identification,\u201d n.d.).<\/p>\n\n\n\n

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Comparison between a Swainson’s Thrush (right) and a Hermit Thrush (left). Credit: The University of Utah (n.d.)<\/p>\n\n\n\n

Behaviour<\/h2>\n\n\n\n

The typical behavior of the Swainson’s Thrush consist of a lot of hops. Despite having the amazing ecological advantage of being able to fly these little guys move on the ground through hopping as they feed off of ground invertebrates and fruits (Wiley et al., 2015). They typically fly in short bursts from branch to branch and a majority of the long flight they do is only when they migrate south. Interspecies aggression between these animals mostly consists of the males singing at one another. This form of aggression, if you can call it that, is generally only limited to the mating season and on the off chance this escalates to physical violence it’s when the more aggressive male pulls feathers out of the male who is fleeing (Animal Diversity Web, n.d.). Can you call it a cat fight if birds are the ones involved?<\/p>\n\n\n\n

Song Calls<\/h4>\n\n\n\n

Swainson’s Thrush has a large variation in song calls, from predator response to mating call variation. When these birds migrate they make a distinct “peep” sound by both male and female. Their predator response is repeating “whit” while flying around from branch to branch, though females freeze in place when protecting their nest. There is also some light variation in mating calls and even a “whit” and “whit-burr” noise both males and females make when their nest is threatened (Animal Diversity Web, n.d.).<\/p>\n\n\n\n

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