Carolina Chickadee (Poecile carolinensis)
- Species account includes photos and facts about this bird's life cycle, natural history, and range.
- http://dromus.nhm.uga.edu/~GMNH/gawildlife/index.php?page=speciespages/species_page&key=pcarolinensis

Chestnut-backed Chickadee (Poecile rufescens)
- Photos, identification tips, migration status, breeding habitat, and nesting. Includes taxonomy chart.
- http://www.mbr-pwrc.usgs.gov/id/framlst/i7410id.html

Paridae (Titmice)
- Descriptions and images of nine North American species.
- http://animaldiversity.ummz.umich.edu/site/accounts/classification/Paridae.html

Poecile atricapilla (Black-Capped Chickadee)
- Taxonomy, range, physical characteristics, and natural history of this bird. Includes photos and a sound file.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Poecile_atricapillus.html

Baeolophus bicolor (Tufted Titmouse)
- Taxonomy, physical traits, food habits, reproduction, and behavior of this species. With photos and sound files.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Baeolophus_bicolor.html

Nesting Blue Tits
- Descriptions of behavior and pictures from a nest box camera.
- http://www.ee.surrey.ac.uk/Personal/D.Jefferies/bird/roost.html

Oak Titmouse (Baeolophus inornatus)
- Images of this species taken in California.
- http://www.birdphotography.com/species/oati.html

Tufted Titmouse (Baeolophus bicolor)
- Photo of this species, range maps, and data on its physical traits, diet, and habitat.
- http://www.nenature.com/tuftedtitmouse.htm

Bridled Titmouse (Baeolophus wollweberi)
- Scientific classification, identification tips, and life history of this species.
- http://www.mbr-pwrc.usgs.gov/id/framlst/i7340id.html

Mountain Chickadee (Poecile gambeli)
- Images of this species taken in California.
- http://www.birdphotography.com/species/moch.html

Black-capped Chickadee (Poecile atricapillus)
- Photo plus facts about this bird's habitat, diet, and physical traits.
- http://www.nenature.com/blackcappedchickadee.htm

Mexican Chickadee (Poecile sclateri)
- Identification tips, migration status, habitat, and nesting of this species. Includes a photo.
- http://www.mbr-pwrc.usgs.gov/id/framlst/i7370id.html

Sexual Selection in the Great Tit, Parus major
- Full text of PhD Thesis by Angharad Bickle, University of Leicester.
- http://www.technobunnies.com/Content/Thesis/