Obviously you have to identify the animal species whose heads are shown in images 1 to 6 and the ones whose tails are shown in images A to F. It's equally obvious that some are easier than others; there is certainly not enough information to identify every species precisely. Fortunately you don't have to, just get as close as you can. Remember that you can enlarge each set by clicking on it (or viewing it in the Gallery).
The real game is pairing up the heads and tails, following the rule that each pair is a common English phrase of the type 'head and tail', using one word from each name.
For example, I considered using images of the head of a Stanley crane and the tail of an olive baboon, which gives 'Stanley & olive', hence 'Stan and Ollie' (leading to Laurel and Hardy, if you prefer). Unfortunately I have no photo of an olive baboon's tail, so I couldn't follow through on that one.*
Note that the word from the animal's head always provides the first word in the phrase. Also note that words from the names may need little additions or subtractions (as in the example above): remember that many species have alternative common names and watch out for tricky beasts like the dodgy homophone and the dreadful pun.
I will mark suggested identities to help, and I think you will need a decent score before you start on the phrases because guessing phrases may give clues to the trickier identities. The winner will be the first person to get all 6 phrases correctly. Enjoy
* Likewise I could only get half way with 'Elephant and Castle' and 'bunting and frolics'.