plumage phase

Juvenile, Immature And Adult Sage Thrashers

By |March 9th, 2020|Categories: Antelope Island State Park, Birds, Box Elder County, Davis County, Sage Thrashers, Utah|Tags: , , , , , , , , , , , , , , , , , |

The comparisons I have made between juvenile, immature and adult Sage Thrashers are basic, there are more ways to determine their age but I wanted to keep the comparisons simple.

An Extreme Variation of Supplemental Plumage in an American White Pelican

By |July 29th, 2016|Categories: American White Pelicans, Bear River Migratory Bird Refuge, Birds, Box Elder County, Utah|Tags: , , , , , , , , , , , , , , , , |

Two days ago while on the auto tour loop at Bear River MBR an American White Pelican caught my eyes because of its unusually dark crown, nape, and neck plumage.

Bald Eagles – Age Progression from one to five years old

By |February 16th, 2011|Categories: Bald Eagles, Birds, Davis County, Farmington Bay Waterfowl Management Area, Utah|Tags: , , , , , , , , , , , , , , , , , , , , |

A simple guide to aging Bald Eagles by their plumage development, legs and their bills with images showing the age progression.

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