The Biodiversity Heritage Library (BHL) provides free & open access to 63+ million pages of biodiversity literature online.
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ALT An historic illustration of different sized eggs
ALT An historic illustration of 9 species of owls perches on tree branches and rocks.
ALT An historic map of north eastern USA, with a red arrow between Washington DC and Chicago
ALT An historic map of north east United States
ALT A screenshot of a post on an online community forum
ALT A screenshot of a post on an online community forum
ALT A screenshot of a post on an online community forum
ALT A screenshot of a post on an online community forum
ALT An historic illustration of yellow and blue striped fish.
ALT A page of beetle specimens with the details of BHL Day 2026 overlaid
ALT A page filled with beetle specimens.
ALT Promotional graphic for the BHL at 20 Anniversary Series featuring the title “Osbert Salvin’s Central American Field Diary” over a background of a handwritten page with a painted illustration of a bird’s head and leg, alongside a “BHL 20” anniversary logo.
ALT Hand-coloured 19th-century illustration of multiple bird eggs with varied speckled patterns and tones, showing differences across species.
ALT Hand-coloured 19th-century illustration of bird eggs in shades of blue, green, and brown, showing natural variation across species.
ALT Hand-coloured 19th-century illustration of bird eggs arranged in a circular composition, highlighting variation in colour and surface pattern.
ALT Hand-coloured 19th-century illustration of multiple bird eggs with varied speckled patterns and tones.
ALT An historic illustration of bright red, yellow, and pink flowers.
ALT An historic black and white illustration of a paper nautilus floating on the ocean. There are boats, a city and hills in the background.
ALT An historic black and white illustration of a paper nautilus floating on the ocean. There are boats, a city and hills in the background.
ALT An historic illustration of bees and butterflies flying around a flowering bush.
ALT A pair of large black and white seabirds (Atlantic yellow-nosed albatross) sitting in the water. There are some more seabirds flying in the distance.
ALT A book on a cushion held open with a weighted rope, with handwriting on the right hand page.
ALT An historic illustration of an array of orchids with a list of their scientific names below.
ALT An historic illustration of an array of orchids with a list of their scientific names below.
ALT An historic illustration of an array of orchids with a list of their scientific names below.
ALT The green cover of an historic book, featuring the title (West Australian Orchids), a line drawing of two orchids, and the author's signature.
ALT An historic image of a school of blue flying fish soaring above waves.
ALT An historic illustration of two colourful pheasants flying in the sky.
ALT Two black and white seabirds flying about choppy waves. There are several more birds in the distance.
ALT An historic illustration of a red and green striped parrot fish.
ALT An historic illustration featuring a pair of red flying fish (gurnards) with green wings.
ALT An historic illustration of a furry brown bat with one wing outstretched.
ALT A double page spread filled with historic illustrations of crabs.
ALT An historic illustration of a small grey monkey with a white face, big round eyes, and black tail, holding onto a branch.
ALT An historic book open to a double page spread: the title pages. There are illustrations of poisonous mushrooms along the bottom of both pages.
ALT An historic book open to a double page spread featuring illustrations of poisonous plants.
ALT An historic book open to a double page spread featuring illustrations of poisonous plants.
ALT An historic illustration of a colorful butterfly
ALT A black and grey gliding possum soaring from a tree.
ALT An historic illustration of a blue, green, yellow, black and red butterfly.
ALT An historic illustration of a coati (a brown mammal with a long stripy tail) standing in a green landscape with frees in the background.
ALT An historic image of a school of blue flying fish soaring above waves.
ALT An adult puffin (a black and white seabird with a red beak and yellow feet) on a rocky cliff above the ocean, feeding a beak-full of small fish to a fluffy black and white chick.
ALT An illustration of a Tamandua (a black and white anteater) walking along a branch.
ALT An historic illustration of a pitcher plant above a marshy scene.