Happy Hunting solution
by Kegler

Six answers contain EGG in one square; these are represented as colored circles in the grid below (they would be “egg-shaped” if I could draw them that way!).
The letters from the crossing entries, from left to right, spell EASTER; hence, your “prey” is Easter eggs.

Happy Hunting solution grid

Across
1SH(Y)E'S + T
5TAM + P
8QUI(L)T
9LAB + OR
12RE + MOTE
13ARP{EGG}IO (OPERA GIG anag)
15B{E(G,G)}AR
16BALS + A (rev)
19S&H + RUG
20SEES (palindrome)
24SEWERS (2 defs)
26ERASER (hidden)
27ANNA + L
28V({EG + G})IES
29E + SPY
30RESIST (SISTER anag)
Down
1SQUA[B/d]S
2HURRAH ("HER RAW" hom)
3EL(K)S
4ST + RINGS
5TAME (MATE anag)
6MOTHer
7P{EGG}ED (1st letters)
10BOWL + {EGG}ED
11SPAR + TAN
14OBSERVE (VERBOSE anag)
17SERIES (hidden)
18ASS + IS + T
21R{E(G)G}AE (EAGER rev)
22URNS ("EARNS" hom)
23IS + A + Y
25WETS (STEW rev)