Here is a kind of creature is know for venomous sting. It’s stinger is at the end of its tail, it doesn’t have much venom but when it uses it it makes sure to inject all of its venom. It’s also for this reason why they are hesitant on attacking. They are up either at day or night, but this one may be nocturnal judging by it sleeping at this time of day. From all the sleeping poses it could have picked it want with this.