There are currently 117 known species of the Order Pelecaniformes which includes 5 families. I have photographed 27 (23.1%) of these species of birds across 3 families shown below with links.
Family: Pelecanidae (Pelicans)
–American White Pelican (Pelecanus erythrorhynchos)
–Brown Pelican (Pelecanus occidentalis)
–Dalmatian Pelican (Pelecanus crispus)
Family: Balenicipitidae (Shoebill)
Family: Scopidae (Hamerkop)
Family: Ardeidae (Herons, Egrets, Bitterns)
–American Bittern (Botaurus lentiginosus)
–Yellow-crowned Night Heron (Nyctanassa violacea)
–Black-crowned Night Heron (Nycticorax nycticorax)
–Little Blue Heron (Egretta caerulea)
–Tricolored Heron (Egretta tricolor)
–Reddish Egret (Egretta rufescens)
–Snowy Egret (Egretta thula)
–Little Egret (Egretta garzetta)
–Green Heron (Butorides virescens)
–Western Cattle Egret (Bubulcus ibis)
–Great Egret (Ardea alba)
–Gray Heron (Ardea cinerea)
–Great Blue Heron (Ardea herodias)
–Striated Heron (Butorides striata)
–Least Bittern (Botaurus exilis)
–Little Bittern (Botaurus minutus)
–Purple Heron (Ardea purpurea)
–Squacco Heron (Ardeola ralloides)
Family: Threskiornithidae (Ibises, Spoonbills)
–White Ibis (Eudocimus albus)
–Glossy Ibis (Plegadis falcinellus)
–White-faced Ibis (Plegadis chihi)
–Roseate Spoonbill (Platalea ajaja)
–Andean Ibis (Theristicus branickii)
–Eurasian Spoonbill (Platalea leucorodia)