other disease Vulture

Strychnine poisoning

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Definition Signs Causes Diagnosis Treatment Prevention Complications When to see a vet Prognosis FAQ Sources Affected species

What is it?

Strychnine poisoning is a serious and often fatal poisoning in griffon vultures (Gyps fulvus). \n\nThis scavenging raptor is exposed when it consumes a carcass or intentionally poisoned bait, usually intended for other predators such as stray dogs, foxes or wolves. \n\nStrychnine is a powerful poison that acts on the central nervous system and causes rapid death, often within tens of minutes after ingestion. It is one of the main causes of unnatural mortality among vultures in several regions of the Mediterranean basin and the Middle East.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Related signs — each one links to its page:

Seizures Tremors Excessive salivation Difficulty breathing Restlessness Lying animal that does not get up Paralysis Fever

The signs appear very quickly after ingestion, sometimes in less than an hour. \n\nThe vulture first presents with unusual agitation, muscle stiffness and tremors. \n\nViolent and generalized convulsions quickly occur, the bird arches back in a characteristic way (opisthotonos posture). \n\nSalivation is excessive, breathing becomes difficult and noisy. \n\nThe bird loses its balance, can no longer stand or fly, then most often dies from asphyxia linked to paralysis of the respiratory muscles. \n\nDue to the speed of evolution, it is rare for a poisoned vulture to be found still alive.

When to consult without delay

This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.

Causes and risk factors

Strychnine is an extremely powerful toxic alkaloid, historically used as rat poison or to eliminate predators considered harmful (stray dogs, foxes, jackals, wolves). \n\nIts use is banned in many countries due to its extreme toxicity and lack of selectivity, but illegal poison baits continue to be placed in some rural or pastoral areas. \n\nThe vulture, an obligatory scavenger, becomes contaminated by consuming the poisoned carcass or the bait itself. \n\nAs vultures often feed in groups on the same carcass, a single poisoned bait can cause the death of many individuals simultaneously, representing a major risk for the already fragile populations of this species.

Living or feeding in areas where there are human-predator conflicts (extensive breeding, protection of herds). \n\nPresence of illegal poisoned bait intended for other carnivores. \n\nGriffon vulture's gregarious behavior when feeding, which increases the number of victims around the same poisoned carcass. \n\nAreas where monitoring of poisoning practices is insufficient.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

The diagnosis is most often established after the death of the bird, by a veterinarian or a laboratory specializing in wildlife. \n\nAutopsy and toxicological analyzes of digestive contents, liver or blood confirm the presence of strychnine. \n\nIn the field, the discovery of several corpses of vultures and other scavengers around the same carcass is a very suggestive sign of intentional poisoning and must be reported to the competent authorities (veterinary services, environmental police).

Treatment

There is no widely available specific antidote for strychnine. \n\nIf a bird is found alive and taken care of very quickly by a wildlife conservation center, supportive treatment can be tried: control of convulsions using sedatives or anticonvulsants, oxygen therapy, rehydration. \n\nThis treatment must be carried out as an absolute emergency by a veterinary team specializing in wildlife, the prognosis remaining very poor given the rapid action of the toxicant.

Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.

Prevention

Prevention is based above all on the fight against the illegal depositing of poisoned bait, which is a matter of territorial regulation and surveillance. \n\nRaising awareness among breeders and local populations of the dangers of these practices, both for protected wildlife and for public health, is essential. \n\nThe implementation of programs to monitor vulture colonies and quickly remove suspicious carcasses makes it possible to limit the number of victims. \n\nSpecialized teams (“anti-poison units”) exist in certain countries to detect, secure and neutralize contaminated areas.

Possible complications

Death generally occurs very quickly from asphyxia, linked to paralysis of the respiratory muscles during convulsions. \n\nAt the population scale, the poisoning of several individuals around the same carcass can have a significant demographic impact on griffon vulture colonies, a species already vulnerable in several regions.

When to see a veterinarian

Discovery of a vulture showing convulsions, tremors or an inability to stand.\nObservation of several dead or dying birds around the same carcass.\nSuspicion of leaving poisonous bait in an area frequented by vultures.\nDiscovery of a vulture corpse with no apparent cause, requiring an autopsy.

Prognosis

The prognosis is extremely guarded to grim. \n\nDue to the rapid action of strychnine, most vultures die before any treatment is possible. \n\nEven when a bird is discovered alive, the chances of survival remain low despite intensive care.

Frequently asked questions

Can a vulture be saved after ingesting strychnine?

It's very rare. Strychnine works in just a few dozen minutes, and most birds die before help can be provided. Being taken care of by a wildlife center in the very first moments offers a low chance of survival.

Why are vultures particularly affected by this poisoning?

Vultures feed exclusively on carcasses, often in groups. A single poisoned bait intended for a predator such as a stray dog or a wolf can therefore kill several vultures at the same time.

How to recognize strychnine poisoning in the field?

The discovery of several corpses of scavenging birds around the same carcass, without apparent injury, should raise suspicion of intentional poisoning. Only a toxicological analysis can confirm strychnine.

What should I do if I discover a suspicious carcass or dead vultures?

Avoid touching the carcass or corpses and immediately alert the competent authorities (veterinary or wildlife protection services), as it may be a dangerous poisoning site for other animals and for humans.