The tick, or "hard tick," is a type of external parasite that feeds on the blood of birds, mammals, or reptiles. It is a member of the family Ixodidae and is found around the world. Ticks can be divided into two main categories: soft ticks and hard ticks. Hard ticks have a hard shield on their back, which is the only way to tell them apart from soft ticks.
When a tick attaches to a host, it can be in any of four stages: egg, larva, nymph, or adult. The adult stage is the only one that feeds on a host's blood. After a tick has attached to a host, it begins to engorge itself with blood. As it does, its body expands and hardens, forming the hard shield on its back. This hard shield is what gives the tick its distinctive shape.
When the tick is finished feeding, it releases its grip and falls to the ground. It then goes through a moulting process, which involves shedding its skin and growing a new one. This process can take up to 48 hours, during which time the tick is in its "hard" form.
Once the moulting process is complete, the tick is ready to find another host. It can do this by using its sense of smell or by detecting any movement nearby. Once it finds a host, the process begins again.
In summary, the tick comes out in its hard form after it has finished feeding and gone through the moulting process. This form is characterized by a hard shield on its back, which helps it to detect hosts and attach itself to them.