Ivo Jacobs

@ivojacobs.bsky.social

3596 Followers 1366 Following

Cognitive zoologist investigating the evolution of animal cognition, particularly in response to fire (pyrocognition). Amateur wildlife photographer based in southern Sweden. More interested in rare behaviours than rare species.

The fledgling seen from the side, with distinctive pale eyes and pink inside the beak, turning its head with beak open, while the parent places food in its beak
A Eurasian magpie perched on a metal fence, seen from the back with its head turned to the camera. Bare skin patches caused by moulting can be seen on the head, while the shiny, colourful feathers of the tail and wing appear to be in pristine condition.
Side profile of a the head of a mute swan, gazing up, against a water background.
An Egyptian gosling feeding on grass and flowers, two of its siblings napping in the background
A graph comparing the number of neurons in the telencephalon of reptiles, birds, and two estimates for T. rex. Even the lowest of these estimates suggests the telencephalic neuron count of T. rex to be similar to that of a pygmy falcon or blackbird - several times more than the largest telencephalic neuron count of extant reptiles.
A galah perched on a branch with wing outstretched and head missing (because it's preening)
Side view of a small Egyptian gosling with a foot up, walking over a street
Close-up of a mute swan preening itself, showing only its head with closed eyes rubbing against a sea of white feathers
A male tufted duck, in black and white plumage, preens his back while floating on a lake, with the vibrant yellow eye halfway closed.
Eight brown-and-white Egyptian goslings on a small wave in a river facing the observer
Two geese flying low over a lake - one flying to the side of the frame and the incoming goose flying in from the top of the frame, ready to attack with wings spread and bill open. The background reflections on the lake form streaks of light.
Two little wild boars, seen through thick foliage with a lake in the background, having a nap against a tree
A long-tailed tit perched on a leafy branch, seen from the side in blue morning light
A galah, in its typical pink and grey plumage, poses on a dead branch with wings spread and fluffy head crest raised.
Close-up of a small Egyptian gosling, in white-brown plumage, on the ground looking towards the viewer.
A carrion crow with a piece of bread in its beak on a grass field, being watched by another crow far away as a blurry, dark shape
A fluffy, brown-white gosling stepping out of a river, with head turned sideways and one foot off the ground.
An adult common starling seen from behind, with its head turned sideways towards the camera, showing its iridescent spotty plumage while standing in a grass field.
Two adult grebes on a lake, one preening in the foreground, the other surrounded by two swimming offspring and two on its back, on of which curiously looking at a sibling.
A Eurasian coot perched on a submerged stick on a lake while preening, its eye closed and bill under the wing.
An Eurasian coot skipping over the surface of the lake captured at high frame rate, as if it's hovering over its reflection with a splash of water where it stepped.
A young Eurasian coot on a lake, surrounded by reeds, tilting its head to accept a food transfer from a parent.
A fluffy brown-grey coot juvenile seen from the side, with orange bill, against a green grassy background
A carrion crow walks towards the camera with its head tilted, surrounded by green grass and small flowers
A carrion crow lying down in a meadow, surrounded by grass and small flowers.
A Eurasian nuthatch clinging upside down and vertically against a tree trunk in its typical pose, while holding a sprouted seed in its bill tip.
Three little grey-brown birds with yellow bills looking around while perched on a mossy stone
Close-up of a rainbow bee-eater from the side, showing its vibrant colourful plumage, red iris, and decurved bill, against a brown-grey background.
Monochrome picture of several trees, with a crow perched in one, with thick smoke covering the grasses and termite mounds on the ground.
A monochrome image showing the silhouette of a black kite - its tail turned diagonally compared to its horizontal wings - through thick smoke with soot particles flying around, and dark branches of a dead tree on the side.
A dark image of a nankeen night heron juvenile facing the camera directly, with most of its body too dark to see details except some light on its back, bill, and yellow eyes.
Dark monochrome picture of a Torresian crow - its bright eyes standing out - perched on top of a metal sign that says "Registered sacred site. Beyond this point lies a site of traditional significance to Aboriginal people. Please respect the sanctity of this area."
The fledgling Eurasian nuthatch and its parent appear to be on a horizontal trunk, but are actually clinging vertically to a big tree trunk, surrounded by moss and bark.
Side view of a fledgling black redstart in a garden, holding a dead bug in its bill
A black kite perched on a big branch actively looks around showing its feet covered in black soot from walking over burned terrain
A tree on the savanna of northern Australia, in which four pink galahs are perched. The one with less vibrant colours is a fledgling and is being fed by a parent, making quick up-and-down movements while their beaks are touching.
A black kite elegantly navigates smoke and fire over the burning savanna of the Top End of North Australia.
A monochrome picture of a dead branch against a grey sky with several woodswallows perching, arriving, or leaving on the wing in a dynamic composition.
A double-barred finch draped in sunlight against a black background, perching on the side of a barbed leaf while facing the camera
A tame raven sitting on my arm, looking up at the camera with her big eyes, accentuated by a shallow depth of field
An Eurasian nuthatch on the ground between dry leaves and grass, pictured at eye level, holding a hazelnut in its bill.
A blackbird pictured at eye level between leaves and acorns, seen from the front, with an open bill holding a piece of food
A blue tit walking on a frosty beam with one foot lifted, with a shallow depth of field
A European robin seen from the side standing on a fence, in a round posture with wings motion blurred and ice around its bill against a snowy background
A great spotted woodpecker male clings vertically against an electricity posts covered in snow, showing holes he made in which he caches food.
A coal tit in mid air with its feet up, having just left a snowy branch on the side of the frame, looking sideways with wings spread against a white-blue background.
A treecreeper seen from the side vertical against a lichen-covered tree trunk, in front of a blue sky
A great tit seen from the side, perched on the head of a small turtle statue covered in frost
An Eurasian nuthatch perched on a branch with one foot next to its body (in the middle of scratching)
A female bullfinch perched on a small snowy branch with seed remains around her bill.
Close-up of a blackbird male holding a mixture of invertebrate prey in his bill, to be fed to his chicks.
A Eurasian treecreeper rests while walking vertically up a tree trunk against a green background, seen from the side.
A heron and cormorant perched on a tree with white blossom over a lake. Both are preening themselves in the same posture.
A red squirrel clings to a lichen-covered tree trunk, seen from the side through budding green leaves
A monochrome picture of a conifer forest engulfed in smoke, penetrated by bright sunlight, with reeds in the foreground and a person standing far away close to the smoke.
Close-up of a greyleg goose from the side, with its bill open revealing its upward tongue during honking
A male bullfinch, with its characteristic crimson chest plumage, between wilted leaves eating sedge seeds, which are stuck to his beak.
Conifer trees surrounded by thick smoke with an orange orb between them - the sun.
Close-up of a black-and-white patterned moth on a green surface