6		See 17
7		Relatively streamlined, fast- swimming marine mammals, up to 20 metres in length (3,6)
9		Main breeding grounds of the Northern __ __ are the Pribliof and Commander islands, Bering Sea (3,4)
10		Birds of prey, between peregrine falcons and merlins in size (7)
11/12		One name for the thylacine of Australasia, now thought to be extinct (9,5)
14		Small, long-eared, domesticated animal of the horse family (3)
15		Type of jaguarundi – disturbed a ray, etc (4,3)
17/6		Common rorqual, second largest animal on earth (3,5)
18		West Indian dance helps make slim bottle-nose! (5)
20		The nostril on top of e.g. a dolphin's head (5-4)
22		Physical evidence of animals/plants of a past geological age (7)
23		The Komodo dragon is the largest such lizard (7)
25		Ibis-like bird, named after its long, flattened beak (9)
26		Replenish, e.g natural resources (5)

1		The only fin-footed mammals to have tusks (8)
2		Biologically, groups of closely- related species (6)
3		Organism growing on rocks, trees, etc., the symbiosis of a fungus and alga(e) (6)
4/22		It lashes its tail to leave the water and glides through the air with wing-like fins (6,4)
5		A goddess of ancient Eygpt, sometimes depicted with a cow's head (4)
6		In brief, an international body to protect endangered wildlife and habitats (3)
7		A type of ant or termite, one of whose tasks is to defend against enemies (7)
8		Natural environment in which an animal or plant normally lives (7)
11		Track or scent left by an animal (5)
13		That of a whale's call can be hundreds of miles (5)
15		The denudation of the landscape by wind, water or ice (7)
16		Substance produced in the craw of e.g. doves to feed new-born chicks (4,4)
17		Sargasso Sea gets its name from 'sargassum', a __ seaweed (8)
19		Long-haired ruminant, the male of which issues a strong scent in rut (4,2)
20		Type of finch: European variety has black cap and yellow-tinged breast (6)
21		Treeless, level ground such as that inhabited by the Arctic fox (6)
22		See 4
24		Untreated, as sewage might be (3)