Important taxonomic aids

Herbarium:-
A collection of plants that usually have been dried, pressed and preserved on sheets for reference. Standerard size is 41*29 in cm .
Largest herbarium of the world is at Kew

Botanical gardens :-
Collection of living plants maintained for reference.
Largest botanical garden is in Moscow.
Most famous botanical garden is Royal Botanical Garden, Kew.

Zoological Parks:-
Enclosed areas where animals are kept in open enclosures instead of cages.
Help to study wild animals and there food  habits.
Useful for ex-situ conservation through captive breeding of endangered animals.

Museums:-
A place used for storage, preservation and exhibition of objects of natural antiquities.
Provide information not only about local flora and fauna but also of other areas.

Keys:-
Given by John Ray , this scheme is for identification of plants and animals based upon similarities and dissimilarities.
It is dichotomatic table of alternate characters known as couplet ,each character of couplet is called Lead.
The one present in organism is chosen and other ia discarded.
Separate keys are used for each category.