A bird watcher or an aviphile (literally "Lover of birds"). For those with roots in Middle Earth, Aiwendil (Tolkeinian Elvish for "Lover of birds").
An aviculturist.
bird teachers
avian
Aquarist is someone who has aquariums and cares for fish
A person who takes care of building a school is typically referred to as a contractor.
a person who rides elephants is called a mahout
annathavalam
Building Custodian.
A guardian takes care of his/her ward.
They are called a Menagerie Man.
a tree doctor
It is called a social worker
Falconer
Falconer
Falconer
The person who takes care of pets would be called a veterinarian (a.k.a vet)
a stablehand
The Purser and his staff, including Stewards
Aquarist is someone who has aquariums and cares for fish
A person who minds sheep is called a shepherd - which comes from sheep herder.A person who takes care of sheep - is a shepherd.