It depends on what it says on your entry visa. If you enter the UK on a visitor's visa, it usually allows you to stay for six months, after which you have to leave.
Are you seeking a visitor visa for the UK?
Do you intend to apply for a family visitor visa to the UK?
the UK
Yes, UK visitor in transit visas are required for travelers passing through the UK on their way to another destination.
American robins,occasionally.
The maximum duration allowed for a UK visitor visa under the 180 days rule is 180 days in a 12-month period.
Yes
You can, but only if you acquire a Marriage Visitor visa, which will allow you to stay 6 months in the UK.
Ask your pediatrician (or health visitor if you are in the UK)
There are about 59 species of butterflies known to breed in the UK, with occasional visitor species also recorded.
new zealand, UK, USA
As much as you want. There are no limits on visiting Scotland, or anywhere else in the UK