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The Olive-sided Flycatcher (Contopus cooperi) is a small to medium sized passerine bird in the family Tyrannidae, the Tyrant flycatcher family. It is a migratory species that travels from South to North America to breed during the summer. It is a very agile flyer and mainly consumes flying insects on flight. Since 2016, this species has been assessed as being near-threatened globally (IUCN) and threatened in Canada (SRA) due to its declining populations.

Identification
Olive-sided Flycatchers are migratory songbirds which are relatively small. It is qualified as small to medium-sized birds and are estimated to be smaller than American Robins, but bigger than Sparrows. The olive-sided flycatcher can be identified by its olive-grey or grey-brownish plumage above and with a white mid-breast section and throat. The olive tones on its back and wings are seen mainly in optimal light and when the feathers are freshly moulted. The sides of the breast area are grey and make the bird look like it is wearing a vest (see Fig. 2). It has a relatively long bill and long wings for its size. Sometimes, some of its head feathers can be raised which make it look like it has a small crest. The species does not exhibit sexual dimorphism, which means that male and female look similar. Olive-sided Flycatchers perch in upright positions on top of dead branches or trees.

Similar species
Olive-sided flycatchers can be confused with other birds in the genus Contopus like the Greater Pewee, Western Wood-Pewee, Eastern Wood-Pewee, and the Eastern Phoebe. They can be distinguished these species by observing the following differences: the plain grey breasts of the Greater Pewee (as opposed to the vest-like chest of the olive-sided flycatcher), they are twice the weight of the Western and Eastern Wood-Pewees, and the Eastern Phoebe has more white underparts than the olive-sided flycatcher.

Taxonomy
Olive-sided Flycatchers (Contopus cooperi) are part of the class Aves in the order Passeriformes, meaning they are passerines which are known as perching or song birds. They are part of the family Tyrannidae because they are Tyrant flycatchers found in America and they belong to the genus Contopus which is the Pewee taxon. Pewees are known as being insect-eaters who catch their prey generally in flight.

Distribution and habitat
The olive-sided flycatcher is distributed throughout North and South America. Its breeding habitat ranges from California to New Mexico, all the way up to central Alaska, then across Canada (except for most of the Northwest Territories and Nunavut) and through a portion of northeastern US. Its non-breeding habitat is mainly in the northern part of South America and a small area in Central America.

Their breeding habitat is mainly in open areas or edges of boreal, coniferous forests or temperate western forests, in areas up to 10,000 feet in elevation (e.g., in the Rockies), and always near water. They can also nest in cities or on farms. In their non-breeding habitat, Olive-sided Flycatchers use similar habitats as their breeding habitats such as open areas and forest edges, but do not need water proximity as much as in their breeding habitat. They are also associated to habitats with very tall trees. Two forest habitats used by Olive-sided Flycatchers in the winter are tropical montane and tropical lowland evergreen forests.

Behaviour
In a study made in the Northwest Territories to determine flight behaviours of Olive-sided Flycatchers near their nests, it was found that four out of eight males would fly from 0 m to 49 m away from their nest and would sing only when at a distance of more than 100 m. It was also found that pairs whose nests were in more open areas did not travel as far than when nests were deeper in the forest.

Vocalizations
Vocalizations are made by songbirds through songs which are for breeding purposes or through calls to communicate with other individuals of its species. During the breeding, olive-sided flycatcher males sing a song to attract a mate. Its song sounds like it is saying “Quick, three beers!” with three successive high-pitched sounds. The first sound is shorter and not as high-pitched and loud as the two others. Sometimes, during mating season, males can produce growling sounds or even squeaks when in conflict with other males. Calls are produced by birds to communicate with one another. This species' most frequent call is 3 quick successive pip sounds.

The rate at which males sing varies throughout the breeding season. This variation appears to be correlated indirectly with the breeding status (single, paired, or feeding young) of the individuals.

Reproduction
Olive-sided Flycatchers breed once per year and usually get clutches of 3 to 4 eggs. The incubation period lasts for 15 to 19 days and so does the nestling period. The egg size is approximately 0.8-0.9 inches long by 0.6-0.7 inches wide and is a creamy white colour with brownish spots that form a ring on the larger end of the egg. The nest location is chosen by the female and is usually on a horizontal branch of coniferous trees, but have also been seen on other types of trees. The lowest nest was 5 feet high on a tree and the highest was 197 feet. In Western regions, Olive-sided Flycatchers tend to have higher nests than in their Eastern distributions. The nest is about 4.6 inches wide on the outside and 2.8 inches wide on the inside and is cup-shaped. The outer part is made with twigs and small branches, while the inside is usually lined with finer material such as grass, lichen, needles, etc. The hatching are born naked and helpless.

Diet
Hawking is the main feeding method used by Olive-sided Flycatchers. They feed on flying insects (e.g., bees, wasps, moths, beetles, grasshoppers, etc.) and capture them in the air. They will sometimes feed on fruit during migration and non-breeding season.

During parental care, Olive-sided Flycatchers were found to consume its chicks' fecal sacs. Indeed, both sexes appear to do so within the first week of hatchings' lives, then start to remove them from the nest. This behaviour is thought to act as a supplement in the parental nutrition.

Conservation
According to the IUCN Red List in 2016, the olive-sided flycatcher is classified as a “Near Threatened” species. The criteria for a species to fit in this conservation status is when the taxon does not fit within the Critically Endangered, Endangered or Vulnerable categories, but is likely to fit within one of them in the near future. The Canadian Species at Risk Act lists the Olive-sided Flycatcher as threatened due to its declining population.

The Olive-sided Flycatcher's global population is estimated at 1,9 million individuals but appears to be declining at a rate of 2.974% of the population per year and has declined by 79% in the past 50 years.

Climate Change
With climate change becoming increasingly important and causing important changes in the ecosystems, a study was made in Nova Scotia to predict climate-resilient habitats which would be suitable for Olive-sided Flycatchers. The authors built a model which considered mean canopy height as the most important factor to consider for this species because it needs a habitat with tall trees. The results suggest that the relative habitat suitability for Olive-sided Flycatchers in the area of study (Nova Scotia) increased with canopy height and decreased as the habitat moved further away from conifer-dominated forests and areas with dead material which is known to be crucial for their feeding habits. This species is also expected to prefer valleys, lowlands and flatter areas which have the potential to form wetlands or streams. The results from this study determined that the forests used in Nova Scotia have a high potential for Olive-sided Flycatcher populations to be resilient to climate change.

Threats or Survival
A research made in Eastern Canada showed that disturbances caused by human activities and road proximity have a negative impact on Olive-sided Flycatcher populations in Canadian national parks. This study helped quantify the importance of protected areas for the species.

The loss of wintering habitat might be one of the main causes for its population decline. However, they do not seem to be directly impacted by forest loss, although they might be sensitive to it. Declines in flying insect populations due to insecticide use is what is thought to impact most directly the species. In their non-breeding habitat, on the east slope of Andres, the winter populations are highly threatened, but the exact threats have not yet been identified. Burned or freshly-logged forests are great foraging habitats for the Olive-sided Flycatchers due to the increased presence of flying insects, but they could be negatively affected in these environments by wildfire suppression techniques or salvage logging. Collisions with communication towers seem to be another cause of mortality threatening Olive-sided Flycatchers.