"primary source"

#13238244

25 January 2026

A view of a tree trunk in Unterfoehring, Bavaria, Germany, on January 25, 2026, reveals deep gnaw marks and wood chips created by beavers. During the winter months, these rodents frequently fell trees to access bark as a primary food source.

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#13238245

25 January 2026

A detailed view of a tree trunk in Unterfoehring, Bavaria, Germany, on January 25, 2026, reveals deep gnaw marks and wood chips created by beavers. During the winter months, these rodents frequently fell trees to access bark as a primary food source.

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#12619668

6 August 2025

The American goldfinch (Spinus tristis) collects thistle plant down in Toronto, Ontario, Canada, on August 8, 2025. American goldfinches utilize thistle plant down to line their nests and also consume thistle seeds. This behavior is so characteristic that they are sometimes nicknamed 'thistle birds'. The downy material from mature thistles provides insulation for the nest, and the seeds are a primary food source, even for nestlings.

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#12619669

6 August 2025

The American goldfinch (Spinus tristis) perches on a thistle plant in Toronto, Ontario, Canada, on August 2, 2025. American goldfinches utilize thistle plant down to line their nests and also consume thistle seeds. This behavior is so characteristic that they are sometimes nicknamed 'thistle birds'. The downy material from mature thistles provides insulation for the nest, and the seeds are a primary food source, even for nestlings.

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#12619674

6 August 2025

The American goldfinch (Spinus tristis) perches on a thistle plant in Toronto, Ontario, Canada, on August 2, 2025. American goldfinches utilize thistle plant down to line their nests and also consume thistle seeds. This behavior is so characteristic that they are sometimes nicknamed 'thistle birds'. The downy material from mature thistles provides insulation for the nest, and the seeds are a primary food source, even for nestlings.

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#12619675

6 August 2025

The American goldfinch (Spinus tristis) perches on a thistle plant in Toronto, Ontario, Canada, on August 2, 2025. American goldfinches utilize thistle plant down to line their nests and also consume thistle seeds. This behavior is so characteristic that they are sometimes nicknamed 'thistle birds'. The downy material from mature thistles provides insulation for the nest, and the seeds are a primary food source, even for nestlings.

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#12571252

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571254

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571255

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571256

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571257

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571258

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571259

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571260

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571261

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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#12571262

21 July 2025

River nomadic people live on boats on the outskirts of Dhaka, Bangladesh, on July 20, 2025. Their primary source of income comes from selling clothes, women's products, and toys while they travel from village to village.

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