Many species of birds are found along the stream during the seasons and can be seen feeding on hatching stream insects like caddis during their hatching periods. Several beaver families utilize the alder covers found along the brook .

The water temperature stays cold ( 64 degrees F) even during July and several locals are found casting flies before dark even as late as July. The brook flows under Route 100 and ends its path emptying in the Royal River by the Depot Road railroad tracks.

Collyer Brook is a special water to many users, not just fishermen that rise to the challenge of fishing its waters. The brook is changing each year as many see evidence of increased sediments, course change and bank undermining due to strong storms. There is a dam partway that increases the solar warming of the brook downstream to the Royal confluence .

A survey of the changing streamside habitat conditions are planned by the conservation committee of the Trout Unlimited Sebago chapter to improve and maintain the special cold water habitat of the brook and its piscatorial inhabitants.