active adventure backpacker hike hiker hiking mountain nature outdoors outside people recreation sports tourism Trekking walk walking animal dream forest leaf leaves mood moody outdoors outside rodent squirrel tree trees wood woods yellow beak bird blue heron dock eyes feathers Heron legs roof shingles sky wading bird female friends fun girl girls group happiness happy joy jump jumping teenager Teenagers young youth bugs feeding green heron juvenile pond stalking wading water beach fisherman fishing fresh fish rocky beach sea fish sea fishing sea life silhouette silver fish book books campus carry carrying education hold holding learn learning park school student study activity bicycle bike blue city colors funny gradients groningen illustration metal silver tandem tube