There are several ways you can find out if a journal is peer-reviewed.
1) Check the home page of the journal. Generally if a journal is peer-reviewed, they are not going to be shy to say so.
2) Use the 'peer-reviewed journal' limiters on databases such as EBSCO, Articles Express. Note: The vast majority of content on ScienceDirect is peer-reviewed as well.
3) Insert the word "peer-reviewed" in your search on other databases.
4) Use Ulrich's Web to search for a journal title. If a journal is peer-reviewed, it will have this icon on the left hand side: 
Warning: A few journals say that they are peer-reviewed, but still publish some non-peer-reviewed articles. Check the journal home page/s carefully, especially if you can't find a DOI, and if you're unsure if an article is peer-reviewed, contact Adrian.
Multi-database Searching
Click here to search across a wide range of animal studies-related databases simultaneously. This is a good starting point, but will not support in-depth searches.
Individual Databases
These databases are useful when searching for articles in the biodiversity subject area.
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This link opens in a new window This link opens in a new window This link opens in a new window This link opens in a new window This link opens in a new window'Notornis' is the Journal and 'Birds New Zealand' is the Magazine of the Ornithological Society of New Zealand. Click here for online versions of articles from the latest editions.
("Purple Alcea rosea : Close-up - Order : Malvales - Family : Malvaceae" by PJDespa is licensed under Creative Commons Attribution-Share Alike 3.0 Unported licence)