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As spring weather warms, many people start to notice purple martins. These colorful birds are a welcome sign of the season and can be seen throughout North America. They are highly social, building large nesting colonies in well-established sites, and often roosting together by the thousands. In a good season, the number of martins can be quite high, but they face the same threats that impact other bird species — competition with other birds for nest sites and habitat loss. Fortunately, we can help by