These are the answers to Wildlife crossword 13.
ACROSS
6 Two-toed
7 Onion
9 Rail
10 Greenfinch
11 Electric
13 Animal
15 Glen
17 Serin
18 Oryx
19 Joshua
20 Bluebell
23 Palaeozoic
26 Moas
27 Drill
28 Arizona
DOWN
1 Coelacanth
2 Conger
3 Edge
4 Mountain
5 Kiwi
6 Trail
8 Nectary
12 Carob
14 Iron bamboo
16 Leopard
17 Sea holly
21 Urchin
22 Liana
24 Acid
25 Opal
Main image: Bluebells. © Rebecca Gibson
This crossword originally appeared in BBC Wildlife Magazine. Take a look inside the current issue and find out how to subscribe.