What is the best and higest animal to attart to your garden to level up? also, what plants are good to help. I'm level v

You're level 42 so you're done with levelling up.  You can plant up for anything you like.

Have a look at the Wildlife Guide and see what you fancy trying for there.  You still have some of the wildlife from levels 1 - 42 which you haven't done, and there are lots of the "challenges" you haven't done either - butterflies, babies, fairytales, pond, chicks ... see what you fancy and give it a go.

I think they mean legendary levels Tracey not the wildlife levels?

If you click on the legendary tab underneath the wildlife tab it says:

More Info About Wildlife Levels

Your "Wildlife Level" is determined by the number of Diamonds you have earned by spotting and attracting Wildlife.

You attract wildlife to your Garden by leaving food out for them to eat. Growing different plants will help to attract different types of wildlife.

To spot wildlife, you need to water a plant in the Garden - if any wildlife is there, you will see it after watering. The best place to find new Gardens to hunt in is our Wildlife Guide, where Gardeners will post messages inviting new wildlife spotters to their Gardens.

Achieving new Wildlife Levels will help you to unlock 'Magical Mushrooms' for growing in your Garden (see the 'Mushrooms' section in the seed shoppe for full details.)

Happy Hunting!

So I guess it still is wildlife levels but you unlock the different enchanted Mushrooms.

kiwi are a high diamond critter to attract.   I usually plant for these when I need diamonds

To be quite honest, I'd suggest that if it's wildlife diamonds you want, you still go for something you fancy, even with a lower diamond count.   Kiwis and other high diamond wildlife can be difficult to attract even with a good setup, and you may get fewer visitors than if you were set up for lower diamond, longer-staying, wildlife, which drops supershroom seeds.  A full plate of hedgehogs or grey squirrels, for instance, is likely to bring you in more diamonds than a plate with only one or two of the rarer wildlife.

I'd still suggest having a go at something you fancy from the Wildlife Guide.  All wildlife gives diamonds, and you might find something that you really enjoy - rather than just putting in a setup and leaving it for ages to get your diamonds :)

My suggestion is to go with something in demand.

For instance, if the majority of fairyland is doing Alice critters.  Then a set up for card gardeners should yield fully spotted plates.  Setting up for a high value critter doesnt do much good if they are all missed.

Thank you all so much  :)