Terragen 4.4.44, Pixelmator 1.6.4
Heron courtesy Radovan Zierik @ https://www.pexels.com/photo/great-blue-heron-flying-3912764/
Duck #1 courtesy Printable Models @ https://free3d.com/3d-model/bird-v1--283947.html
Duck #2 courtesy Printable Models @ https://free3d.com/3d-model/bird-v1--374169.html
Various grasses and bushes courtesy Philip C. Matthews @ http://mrlamppost.com/tg2/downloads/objects.htm
Also available @ https://www.deviantart.com/jhmartinez/art/Myrlie-Creek-845132442